2.2.0.7 true Fair Value Measurements (Details) (USD $) 009020 - Disclosure - Fair Value Measurements (Details) true false In Millions false false 1 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 u003 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 u003 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Assets 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Cash equivalents 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisCashAndCashEquivalents us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 true true false false 2230000000 2230 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 4 Marketable securities 2 us-gaap_MarketableSecuritiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 5 U.S. Treasury securities and government-related securities 2 qcom_MarketableSecuritiesUsTreasurySecuritiesAndGovernmentRelatedSecurities qcom false debit instant This category includes investments in debt securities issued by the United States Department of the Treasury, US Government... false false false false false false false false false false false terselabel false 1 false true false false 950000000 950 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes investments in debt securities issued by the United States Department of the Treasury, US Government Agencies and US Government-sponsored Enterprises. Such securities may include treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years), debt securities issued by the Government National Mortgage Association (Ginnie Mae) and debt securities issued by the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac) No authoritative reference available. false 6 Corporate bonds and notes 2 qcom_CorporateBondsAndNotes qcom false debit instant This category includes information about debt securities that are issued by either a domestic or foreign corporate business... false false false false false false false false false false false false 1 false true false false 5228000000 5228 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about debt securities that are issued by either a domestic or foreign corporate business entity with a promise of repayment No authoritative reference available. false 7 Mortgage-and asset-backed securities 2 qcom_MortgageAndAssetBackedSecurities qcom false debit instant This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of... false false false false false false false false false false false false 1 false true false false 772000000 772 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets (such as mortgage loans or credit-card receivables) No authoritative reference available. false 8 Auction rate securities 2 qcom_AuctionRateSecurities qcom false debit instant Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for... false false false false false false false false false false false false 1 false true false false 171000000 171 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process. It could also refer to a preferred stock for which the dividend is reset through the same type of auction process No authoritative reference available. false 9 Non-investment-grade debt securities 2 qcom_NonInvestmentGradeDebtSecurities qcom false debit instant This category includes information about debt securities that have non-investment grade ratings. false false false false false false false false false false false false 1 false true false false 3159000000 3159 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about debt securities that have non-investment grade ratings. No authoritative reference available. false 10 Common and preferred stock 2 qcom_CommonAndPreferredStock qcom false debit instant This category includes information about ownership interests or the right to acquire ownership interests in corporations and... false false false false false false false false false false false label false 1 false true false false 1604000000 1604 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable nor redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. No authoritative reference available. false 11 Equity mutual and exchange-traded funds 2 qcom_EquityMutualAndExchangeTradedFunds qcom false debit instant This category includes information about investments that pool funds from many investors to invest in a combination of... false false false false false false false false false false false false 1 false true false false 943000000 943 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about investments that pool funds from many investors to invest in a combination of underlying investments (primarily equity investments) and investments that follows an index, commodity or basket of assets that trades like on a stock on an exchange. No authoritative reference available. false 12 Debt mutual funds 2 qcom_DebtMutualFunds qcom false na instant This category includes information about investments in debt securities which are not otherwise provided for in the existing... false false false false false false false false false false false false 1 false true false false 2218000000 2218 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about investments in debt securities which are not otherwise provided for in the existing taxonomy in the form of Domain Members or individual elements No authoritative reference available. false 13 Total marketable securities 2 us-gaap_FairValueMeasuredOnRecurringBasisInvestments us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 15045000000 15045 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 14 Derivative Instruments 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 15000000 15 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 15 Other investments 2 qcom_OtherInvestment qcom false debit instant This element represents a certain statement of financial position asset caption which represents a class of assets, or which... false false false false false false false false false false false terselabel false 1 false true false false 133000000 133 [1] false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Currently it is comprised of the assets related to the Company's deferred compensation plan, which are invested in mutual funds. No authoritative reference available. false 16 Total assets measured at fair value 2 qcom_TotalAssetsMeasuredAtFairValue qcom false na instant The aggregate amount of assets, including [financial] instruments that are classified in stockholders' equity, which are... false false false false false false false false false false false totallabel false 1 false true false false 17423000000 17423 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of assets, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on either a recurring or nonrecurring basis. No authoritative reference available. true 17 Liabilities 2 us-gaap_LiabilitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 18 Derivative instruments 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 20000000 20 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 19 Other liabilities 2 qcom_OtherLiabilitie qcom false credit instant This element represents a certain statement of financial position liability caption which represents a class of liabilities,... false false false false false false false false false false false terselabel false 1 false true false false 133000000 133 [1] false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Currently it is comprised of the Company's deferred compensation plan liabilities. No authoritative reference available. false 20 Total liabilities measured at fair value 2 qcom_TotalLiabilitiesMeasuredAtFairValue qcom false credit instant The aggregate amount of liabilities, including [financial] instruments that are classified in stockholders' equity, which are... false false false false false false false false false false false totallabel false 1 false true false false 153000000 153 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on either a recurring or nonrecurring basis. No authoritative reference available. true 21 Activity for marketable securities classified within Level 3 of the valuation hierarchy 2 us-gaap_TradingSecuritiesBalanceSheetReportedAmountsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 22 Beginning balance of Level 3 marketable securities 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 205000000 205 false false false 2 false true false false 211000000 211 false false false xbrli:monetaryItemType monetary This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c false 23 Total realized and unrealized gains (losses): 2 qcom_TotalRealizedAndUnrealizedLossesGainsAbstract qcom false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 24 Included in investment income (losses), net 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 5000000 5 false false false 2 false true false false -9000000 -9 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) false 25 Included in other comprehensive income 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 1000000 1 false false false 2 false true false false 9000000 9 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) false 26 Settlements 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -25000000 -25 false false false 2 false true false false -21000000 -21 false false false xbrli:monetaryItemType monetary This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) false 27 Transfers into Level 3 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 4000000 4 false false false 2 false true false false 18000000 18 false false false xbrli:monetaryItemType monetary This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) false 28 Ending balance of Level 3 marketable securities 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 190000000 190 false false false 2 false true false false 208000000 208 false false false xbrli:monetaryItemType monetary This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c false 29 Impairment losses on other investments 2 qcom_OtherThanTemporaryImpairmentLossesOnOtherInvestments qcom false debit duration This element represents other-than-temporary impairments recognized during the period on cost and equity method investments. false false false false false false false false false false false terselabel false 1 false true false false 7000000 7 false false false 2 false true false false 13000000 13 false false false xbrli:monetaryItemType monetary This element represents other-than-temporary impairments recognized during the period on cost and equity method investments. No authoritative reference available. false 30 Carrying value of impaired cost and equity method investments 2 qcom_CarryingValueOfImpairedCostAndEquityMethodInvestments qcom false debit instant This element represents the carrying value of cost and equity method investments for which other-than-temporary impairments... false false false false false false false false false false false false 1 false true false false 15000000 15 false false false 2 false true false false 5000000 5 false false false xbrli:monetaryItemType monetary This element represents the carrying value of cost and equity method investments for which other-than-temporary impairments were recognized during the period. No authoritative reference available. false 31 Level 1 0 na true na na No definition available. false true false false false false false false false false false http://qualcomm.com/role/fairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 3 USD true false false false Level 1 qcom_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel1Member qcom_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 32 Assets 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 33 Cash equivalents 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisCashAndCashEquivalents us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1693000000 1693 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 34 Marketable securities 2 us-gaap_MarketableSecuritiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 35 U.S. Treasury securities and government-related securities 2 qcom_MarketableSecuritiesUsTreasurySecuritiesAndGovernmentRelatedSecurities qcom false debit instant This category includes investments in debt securities issued by the United States Department of the Treasury, US Government... false false false false false false false false false false false terselabel false 1 false true false false 41000000 41 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes investments in debt securities issued by the United States Department of the Treasury, US Government Agencies and US Government-sponsored Enterprises. Such securities may include treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years), debt securities issued by the Government National Mortgage Association (Ginnie Mae) and debt securities issued by the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac) No authoritative reference available. false 36 Corporate bonds and notes 2 qcom_CorporateBondsAndNotes qcom false debit instant This category includes information about debt securities that are issued by either a domestic or foreign corporate business... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about debt securities that are issued by either a domestic or foreign corporate business entity with a promise of repayment No authoritative reference available. false 37 Mortgage-and asset-backed securities 2 qcom_MortgageAndAssetBackedSecurities qcom false debit instant This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets (such as mortgage loans or credit-card receivables) No authoritative reference available. false 38 Auction rate securities 2 qcom_AuctionRateSecurities qcom false debit instant Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process. It could also refer to a preferred stock for which the dividend is reset through the same type of auction process No authoritative reference available. false 39 Non-investment-grade debt securities 2 qcom_NonInvestmentGradeDebtSecurities qcom false debit instant This category includes information about debt securities that have non-investment grade ratings. false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about debt securities that have non-investment grade ratings. No authoritative reference available. false 40 Common and preferred stock 2 qcom_CommonAndPreferredStock qcom false debit instant This category includes information about ownership interests or the right to acquire ownership interests in corporations and... false false false false false false false false false false false label false 1 false true false false 1014000000 1014 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable nor redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. No authoritative reference available. false 41 Equity mutual and exchange-traded funds 2 qcom_EquityMutualAndExchangeTradedFunds qcom false debit instant This category includes information about investments that pool funds from many investors to invest in a combination of... false false false false false false false false false false false false 1 false true false false 943000000 943 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about investments that pool funds from many investors to invest in a combination of underlying investments (primarily equity investments) and investments that follows an index, commodity or basket of assets that trades like on a stock on an exchange. No authoritative reference available. false 42 Debt mutual funds 2 qcom_DebtMutualFunds qcom false na instant This category includes information about investments in debt securities which are not otherwise provided for in the existing... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about investments in debt securities which are not otherwise provided for in the existing taxonomy in the form of Domain Members or individual elements No authoritative reference available. false 43 Total marketable securities 2 us-gaap_FairValueMeasuredOnRecurringBasisInvestments us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 1998000000 1998 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 44 Derivative Instruments 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 45 Other investments 2 qcom_OtherInvestment qcom false debit instant This element represents a certain statement of financial position asset caption which represents a class of assets, or which... false false false false false false false false false false false terselabel false 1 false true false false 133000000 133 [1] false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Currently it is comprised of the assets related to the Company's deferred compensation plan, which are invested in mutual funds. No authoritative reference available. false 46 Total assets measured at fair value 2 qcom_TotalAssetsMeasuredAtFairValue qcom false na instant The aggregate amount of assets, including [financial] instruments that are classified in stockholders' equity, which are... false false false false false false false false false false false totallabel false 1 false true false false 3824000000 3824 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of assets, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on either a recurring or nonrecurring basis. No authoritative reference available. true 47 Liabilities 2 us-gaap_LiabilitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 48 Derivative instruments 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 49 Other liabilities 2 qcom_OtherLiabilitie qcom false credit instant This element represents a certain statement of financial position liability caption which represents a class of liabilities,... false false false false false false false false false false false terselabel false 1 false true false false 133000000 133 [1] false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Currently it is comprised of the Company's deferred compensation plan liabilities. No authoritative reference available. false 50 Total liabilities measured at fair value 2 qcom_TotalLiabilitiesMeasuredAtFairValue qcom false credit instant The aggregate amount of liabilities, including [financial] instruments that are classified in stockholders' equity, which are... false false false false false false false false false false false totallabel false 1 false true false false 133000000 133 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on either a recurring or nonrecurring basis. No authoritative reference available. true 61 Level 2 0 na true na na No definition available. false true false false false false false false false false false http://qualcomm.com/role/fairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 4 USD true false false false Level 2 qcom_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel2Member qcom_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 62 Assets 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 63 Cash equivalents 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisCashAndCashEquivalents us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 537000000 537 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 64 Marketable securities 2 us-gaap_MarketableSecuritiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 65 U.S. Treasury securities and government-related securities 2 qcom_MarketableSecuritiesUsTreasurySecuritiesAndGovernmentRelatedSecurities qcom false debit instant This category includes investments in debt securities issued by the United States Department of the Treasury, US Government... false false false false false false false false false false false terselabel false 1 false true false false 909000000 909 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes investments in debt securities issued by the United States Department of the Treasury, US Government Agencies and US Government-sponsored Enterprises. Such securities may include treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years), debt securities issued by the Government National Mortgage Association (Ginnie Mae) and debt securities issued by the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac) No authoritative reference available. false 66 Corporate bonds and notes 2 qcom_CorporateBondsAndNotes qcom false debit instant This category includes information about debt securities that are issued by either a domestic or foreign corporate business... false false false false false false false false false false false false 1 false true false false 5228000000 5228 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about debt securities that are issued by either a domestic or foreign corporate business entity with a promise of repayment No authoritative reference available. false 67 Mortgage-and asset-backed securities 2 qcom_MortgageAndAssetBackedSecurities qcom false debit instant This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of... false false false false false false false false false false false false 1 false true false false 766000000 766 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets (such as mortgage loans or credit-card receivables) No authoritative reference available. false 68 Auction rate securities 2 qcom_AuctionRateSecurities qcom false debit instant Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process. It could also refer to a preferred stock for which the dividend is reset through the same type of auction process No authoritative reference available. false 69 Non-investment-grade debt securities 2 qcom_NonInvestmentGradeDebtSecurities qcom false debit instant This category includes information about debt securities that have non-investment grade ratings. false false false false false false false false false false false false 1 false true false false 3146000000 3146 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about debt securities that have non-investment grade ratings. No authoritative reference available. false 70 Common and preferred stock 2 qcom_CommonAndPreferredStock qcom false debit instant This category includes information about ownership interests or the right to acquire ownership interests in corporations and... false false false false false false false false false false false label false 1 false true false false 590000000 590 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable nor redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. No authoritative reference available. false 71 Equity mutual and exchange-traded funds 2 qcom_EquityMutualAndExchangeTradedFunds qcom false debit instant This category includes information about investments that pool funds from many investors to invest in a combination of... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about investments that pool funds from many investors to invest in a combination of underlying investments (primarily equity investments) and investments that follows an index, commodity or basket of assets that trades like on a stock on an exchange. No authoritative reference available. false 72 Debt mutual funds 2 qcom_DebtMutualFunds qcom false na instant This category includes information about investments in debt securities which are not otherwise provided for in the existing... false false false false false false false false false false false false 1 false true false false 2218000000 2218 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about investments in debt securities which are not otherwise provided for in the existing taxonomy in the form of Domain Members or individual elements No authoritative reference available. false 73 Total marketable securities 2 us-gaap_FairValueMeasuredOnRecurringBasisInvestments us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 12857000000 12857 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 74 Derivative Instruments 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 15000000 15 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 75 Other investments 2 qcom_OtherInvestment qcom false debit instant This element represents a certain statement of financial position asset caption which represents a class of assets, or which... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [1] false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Currently it is comprised of the assets related to the Company's deferred compensation plan, which are invested in mutual funds. No authoritative reference available. false 76 Total assets measured at fair value 2 qcom_TotalAssetsMeasuredAtFairValue qcom false na instant The aggregate amount of assets, including [financial] instruments that are classified in stockholders' equity, which are... false false false false false false false false false false false totallabel false 1 false true false false 13409000000 13409 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of assets, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on either a recurring or nonrecurring basis. No authoritative reference available. true 77 Liabilities 2 us-gaap_LiabilitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 78 Derivative instruments 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 20000000 20 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 79 Other liabilities 2 qcom_OtherLiabilitie qcom false credit instant This element represents a certain statement of financial position liability caption which represents a class of liabilities,... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [1] false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Currently it is comprised of the Company's deferred compensation plan liabilities. No authoritative reference available. false 80 Total liabilities measured at fair value 2 qcom_TotalLiabilitiesMeasuredAtFairValue qcom false credit instant The aggregate amount of liabilities, including [financial] instruments that are classified in stockholders' equity, which are... false false false false false false false false false false false totallabel false 1 false true false false 20000000 20 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on either a recurring or nonrecurring basis. No authoritative reference available. true 91 Level 3 0 na true na na No definition available. false true false false false false false false false false false http://qualcomm.com/role/fairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 5 USD true false false false Level 3 qcom_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel3Member qcom_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 92 Assets 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 93 Cash equivalents 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisCashAndCashEquivalents us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 94 Marketable securities 2 us-gaap_MarketableSecuritiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 95 U.S. Treasury securities and government-related securities 2 qcom_MarketableSecuritiesUsTreasurySecuritiesAndGovernmentRelatedSecurities qcom false debit instant This category includes investments in debt securities issued by the United States Department of the Treasury, US Government... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes investments in debt securities issued by the United States Department of the Treasury, US Government Agencies and US Government-sponsored Enterprises. Such securities may include treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years), debt securities issued by the Government National Mortgage Association (Ginnie Mae) and debt securities issued by the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac) No authoritative reference available. false 96 Corporate bonds and notes 2 qcom_CorporateBondsAndNotes qcom false debit instant This category includes information about debt securities that are issued by either a domestic or foreign corporate business... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about debt securities that are issued by either a domestic or foreign corporate business entity with a promise of repayment No authoritative reference available. false 97 Mortgage-and asset-backed securities 2 qcom_MortgageAndAssetBackedSecurities qcom false debit instant This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of... false false false false false false false false false false false false 1 false true false false 6000000 6 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets (such as mortgage loans or credit-card receivables) No authoritative reference available. false 98 Auction rate securities 2 qcom_AuctionRateSecurities qcom false debit instant Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for... false false false false false false false false false false false false 1 false true false false 171000000 171 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process. It could also refer to a preferred stock for which the dividend is reset through the same type of auction process No authoritative reference available. false 99 Non-investment-grade debt securities 2 qcom_NonInvestmentGradeDebtSecurities qcom false debit instant This category includes information about debt securities that have non-investment grade ratings. false false false false false false false false false false false false 1 false true false false 13000000 13 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about debt securities that have non-investment grade ratings. No authoritative reference available. false 100 Common and preferred stock 2 qcom_CommonAndPreferredStock qcom false debit instant This category includes information about ownership interests or the right to acquire ownership interests in corporations and... false false false false false false false false false false false label false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable nor redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. No authoritative reference available. false 101 Equity mutual and exchange-traded funds 2 qcom_EquityMutualAndExchangeTradedFunds qcom false debit instant This category includes information about investments that pool funds from many investors to invest in a combination of... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about investments that pool funds from many investors to invest in a combination of underlying investments (primarily equity investments) and investments that follows an index, commodity or basket of assets that trades like on a stock on an exchange. No authoritative reference available. false 102 Debt mutual funds 2 qcom_DebtMutualFunds qcom false na instant This category includes information about investments in debt securities which are not otherwise provided for in the existing... false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This category includes information about investments in debt securities which are not otherwise provided for in the existing taxonomy in the form of Domain Members or individual elements No authoritative reference available. false 103 Total marketable securities 2 us-gaap_FairValueMeasuredOnRecurringBasisInvestments us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 190000000 190 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 104 Derivative Instruments 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 105 Other investments 2 qcom_OtherInvestment qcom false debit instant This element represents a certain statement of financial position asset caption which represents a class of assets, or which... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [1] false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Currently it is comprised of the assets related to the Company's deferred compensation plan, which are invested in mutual funds. No authoritative reference available. false 106 Total assets measured at fair value 2 qcom_TotalAssetsMeasuredAtFairValue qcom false na instant The aggregate amount of assets, including [financial] instruments that are classified in stockholders' equity, which are... false false false false false false false false false false false totallabel false 1 false true false false 190000000 190 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of assets, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on either a recurring or nonrecurring basis. No authoritative reference available. true 107 Liabilities 2 us-gaap_LiabilitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 108 Derivative instruments 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 109 Other liabilities 2 qcom_OtherLiabilitie qcom false credit instant This element represents a certain statement of financial position liability caption which represents a class of liabilities,... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [1] false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Currently it is comprised of the Company's deferred compensation plan liabilities. No authoritative reference available. false 110 Total liabilities measured at fair value 2 qcom_TotalLiabilitiesMeasuredAtFairValue qcom false credit instant The aggregate amount of liabilities, including [financial] instruments that are classified in stockholders' equity, which are... false false false false false false false false false false false totallabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on either a recurring or nonrecurring basis. No authoritative reference available. true 121 Auction rate securities [Member] 0 na true na na No definition available. false true false false false false false false false false false http://qualcomm.com/role/fairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 6 USD true false false false Auction rate securities [Member] us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_AuctionRateSecuritiesMember us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false Auction rate securities [Member] us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_AuctionRateSecuritiesMember us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 141 Activity for marketable securities classified within Level 3 of the valuation hierarchy 2 us-gaap_TradingSecuritiesBalanceSheetReportedAmountsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 142 Beginning balance of Level 3 marketable securities 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 174000000 174 false false false 2 false true false false 186000000 186 false false false xbrli:monetaryItemType monetary This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c false 143 Total realized and unrealized gains (losses): 2 qcom_TotalRealizedAndUnrealizedLossesGainsAbstract qcom false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 144 Included in investment income (losses), net 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 0 0 false false false 2 false true false false -2000000 -2 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) false 145 Included in other comprehensive income 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 3000000 3 false false false 2 false true false false 2000000 2 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) false 146 Settlements 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -6000000 -6 false false false 2 false true false false -5000000 -5 false false false xbrli:monetaryItemType monetary This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) false 147 Transfers into Level 3 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 0 0 false false false 2 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) false 148 Ending balance of Level 3 marketable securities 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 171000000 171 false false false 2 false true false false 181000000 181 false false false xbrli:monetaryItemType monetary This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c false 173 Total realized and unrealized gains (losses): 2 qcom_TotalRealizedAndUnrealizedLossesGainsAbstract qcom false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 174 Included in investment income (losses), net 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 5000000 5 false false false 2 false true false false -7000000 -7 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) false 175 Included in other comprehensive income 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false -2000000 -2 false false false 2 false true false false 7000000 7 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) false 176 Settlements 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -19000000 -19 false false false 2 false true false false -16000000 -16 false false false xbrli:monetaryItemType monetary This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) false 177 Transfers into Level 3 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 4000000 4 false false false 2 false true false false 18000000 18 false false false xbrli:monetaryItemType monetary This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) false 178 Ending balance of Level 3 marketable securities 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 true true false false 19000000 19 false false false 2 true true false false 27000000 27 false false false xbrli:monetaryItemType monetary This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c false 1 Comprised of the Company's deferred compensation plan liability and related assets which are invested in mutual funds. 2 107 false Millions UnKnown UnKnown false true