2.2.0.7 true Basis of Presentation (Details) (USD $) 009010 - Disclosure - Basis of Presentation (Details) true false false false 1 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u003 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 2 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 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 3 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 4 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 5 USD false false u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 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 6 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 Notes to Financial Statements [Abstract] 2 qcom_NotesToFinancialStatementsAbstract qcom false 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Number of weeks in a fiscal period 2 us-gaap_FiscalPeriod us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 13 weeks false false false 2 false false false false 0 0 13 weeks false false false 3 false false false false 0 0 39 weeks false false false 4 false false false false 0 0 39 weeks false false false 5 false false false false 0 0 52-53 week false false false 6 false false false false 0 0 52-53 week false false false xbrli:stringItemType string Describes an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end should be noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations also should be disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph b -Article 3A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 06 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph k -Article 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph b -Article 3A false 4 Incremental dilutive common share equivalents 2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 13039000 13039000 false false false 2 false true false false 18781000 18781000 false false false 3 false true false false 16303000 16303000 false false false 4 false true false false 15114000 15114000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:sharesItemType shares Aggregate awards of share options and nonvested shares to be issued to an employee under a share-based compensation arrangement are considered options for purposes of computing diluted earnings per share. Such share-based awards shall be considered to be outstanding as of the grant date for purposes of computing diluted earnings per share even though their exercise may be contingent upon vesting. Those share-based awards are included in the diluted Earnings Per Share (EPS) computation even if the employee may not receive (or be able to sell) the stock until some future date. Accordingly, all shares to be issued shall be included in computing diluted EPS if the effect is dilutive. The dilutive effect of share-based compensation arrangements shall be computed using the treasury stock method. If the equity share options or other equity instruments are outstanding for only part of a period, the shares issuable shall be weighted to reflect the portion of the period during which the equity instruments were outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 20 false 7 Comprehensive Income (Loss) 2 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterestAbstract 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 8 Net income (loss) 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 true true false false 767000000 767000000 false false false 2 true true false false 737000000 737000000 false false false 3 true true false false 2382000000 2382000000 false false false 4 true true false false 790000000 790000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 9 Other comprehensive income (loss): 2 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParentAbstract 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 10 Foreign currency translation 2 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false -56000000 -56000000 false false false 2 false true false false 28000000 28000000 false false false 3 false true false false -58000000 -58000000 false false false 4 false true false false -32000000 -32000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 13, 20, 31 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 19, 26 false 11 Noncredit other-than-temporary impairment losses and subsequent changes in fair value related to certain marketable debt securities, net of income taxes 2 qcom_NoncreditOtherThanTemporaryImpairmentLossesAndSubsequentChangesInFairValueRelatedToCertainMarketableDebtSecuritiesNetOfIncomeTaxes qcom false na duration This element represents other-than-temporary impairments on certain debt securities associated with non-credit factors that... false false false false false false false false false false false false 1 false true false false -7000000 -7000000 false false false 2 false true false false 97000000 97000000 false false false 3 false true false false 13000000 13000000 false false false 4 false true false false 97000000 97000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents other-than-temporary impairments on certain debt securities associated with non-credit factors that are recorded in other comprehensive income, net of tax, combined with appreciation or loss in value, net of tax, of certain unsold marketable debt securities. No authoritative reference available. false 12 Net unrealized (losses) gains on other marketable securities and derivative instruments, net of income taxes 2 qcom_NetUnrealizedGainsLossesOnOtherMarketableSecuritiesAndDerivativeInstrumentsNetOfIncomeTaxes qcom false na duration Appreciation or loss, net of tax, in value of unsold securities (excluding certain marketable debt securities) during an... false false false false false false false false false false false terselabel false 1 false true false false -180000000 -180000000 false false false 2 false true false false 665000000 665000000 false false false 3 false true false false 151000000 151000000 false false false 4 false true false false -283000000 -283000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Appreciation or loss, net of tax, in value of unsold securities (excluding certain marketable debt securities) during an accounting period combined with gains and losses, net of tax, from derivative instruments designated and qualifying as the effective portion of cash flow hedges. No authoritative reference available. false 13 Reclassification of net realized gains on marketable securities and derivative instruments included in net income, net of income taxes 2 qcom_ReclassificationOfNetRealizedGainsLossesOnMarketableSecuritiesAndDerivativeInstrumentsIncludedInNetIncomeNetOfIncomeTaxes qcom false na duration Reclassification adjustment for unrealized gains or losses realized upon the sale of marketable securities, net of tax,... false false false false false false false false false false false terselabel false 1 false true false false -64000000 -64000000 false false false 2 false true false false -85000000 -85000000 false false false 3 false true false false -228000000 -228000000 false false false 4 false true false false -59000000 -59000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Reclassification adjustment for unrealized gains or losses realized upon the sale of marketable securities, net of tax, combined with change in accumulated gains (losses) from derivative instruments classified as hedges. No authoritative reference available. false 14 Reclassification of other-than-temporary losses on marketable securities included in net income, net of income taxes 2 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForWriteDownOfSecuritiesIncludedInNetIncomeNetOfTax 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 16000000 16000000 false false false 2 false true false false 97000000 97000000 false false false 3 false true false false 63000000 63000000 false false false 4 false true false false 587000000 587000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Reclassification adjustment for unrealized gains or losses realized upon the write-down of securities, after tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 18, 19, 22 false 15 Total other comprehensive (loss) income 2 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -291000000 -291000000 false false false 2 false true false false 802000000 802000000 false false false 3 false true false false -59000000 -59000000 false false false 4 false true false false 310000000 310000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents Other Comprehensive Income (Loss), Net of Tax, for the period. Includes deferred gains (losses) on qualifying hedges, unrealized holding gains (losses) on available-for-sale securities, minimum pension liability, and cumulative translation adjustment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 22, 23, 24, 25 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 true 16 Total comprehensive income 2 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 476000000 476000000 false false false 2 false true false false 1539000000 1539000000 false false false 3 false true false false 2323000000 2323000000 false false false 4 false true false false 1100000000 1100000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a false 17 Components of accumulated other comprehensive income 2 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 18 Noncredit other-than-temporary impairment losses and subsequent changes in fair value related to certain marketable debt securities, net of income taxes 2 qcom_NoncreditOtherThanTemporaryImpairmentLossesAndSubsequentChangesInFairValueRelatedToCertainMarketableDebtSecurities qcom false na instant This element represents accumulated other-than-temporary impairments on certain debt securities associated with non-credit... false false false false false false false false false false false terselabel false 1 false true false false 65000000 65000000 false false false 2 false false false false 0 0 false false false 3 false true false false 65000000 65000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false true false false 71000000 71000000 false false false xbrli:monetaryItemType monetary This element represents accumulated other-than-temporary impairments on certain debt securities associated with non-credit factors that are recorded in other comprehensive income, net of tax, combined with accumulated appreciation or loss in value, net of tax, of certain unsold marketable debt securities. No authoritative reference available. false 19 Net unrealized gains on other marketable securities, net of income taxes 2 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 564000000 564000000 false false false 2 false false false false 0 0 false false false 3 false true false false 564000000 564000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false true false false 574000000 574000000 false false false xbrli:monetaryItemType monetary Accumulated appreciation or loss, net of tax, in value of the total of unsold securities at the end of an accounting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 false 20 Net unrealized losses on derivative instruments, net of income taxes 2 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax us-gaap true credit instant No definition available. false false false false false false false false false false false label false 1 false true false false -2000000 -2000000 false false false 2 false false false false 0 0 false false false 3 false true false false -2000000 -2000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false true false false -17000000 -17000000 false false false xbrli:monetaryItemType monetary Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 false 21 Foreign currency translation 2 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false -98000000 -98000000 false false false 2 false false false false 0 0 false false false 3 false true false false -98000000 -98000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false true false false -40000000 -40000000 false false false xbrli:monetaryItemType monetary Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains (losses). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 12, 13 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 31 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17, 18, 19, 22, 23, 24, 25, 26 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 false 22 Total accumulated other comprehensive income 2 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 529000000 529000000 false false false 2 false false false false 0 0 false false false 3 false true false false 529000000 529000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false true false false 588000000 588000000 false false false xbrli:monetaryItemType monetary Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at fiscal year-end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, and unrealized gains and losses on certain investments in debt and equity securities as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 true 23 Other-than-temporary losses on marketable debt securities related to factors other than credit, net of income taxes 2 qcom_OtherThanTemporaryLossesOnMarketableDebtSecuritiesRelatedToFactorsOtherThanCreditNetOfIncomeTaxes qcom false na instant Accumulated other-than-temporary impairments on certain debt securities associated with non-credit factors that are recorded... false false false false false false false false false false false false 1 false true false false 40000000 40000000 false false false 2 false false false false 0 0 false false false 3 false true false false 40000000 40000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Accumulated other-than-temporary impairments on certain debt securities associated with non-credit factors that are recorded in other comprehensive income, net of tax. No authoritative reference available. false 24 Share-Based Payments 2 us-gaap_ShareBasedCompensationAbstract 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 25 Cost of equipment and services revenues 2 qcom_CostOfEquipmentAndServicesRevenues qcom false na duration This element represents the cost of equipment and services revenues recognized during the period arising from share-based... false false false false false false false false false false false false 1 false true false false 10000000 10000000 false false false 2 false true false false 11000000 11000000 false false false 3 false true false false 30000000 30000000 false false false 4 false true false false 30000000 30000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents the cost of equipment and services revenues recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. No authoritative reference available. false 26 Research and development 2 qcom_ResearchAndDevelopment qcom false na duration This element represents the research and development expenses recognized during the period arising from share-based... false false false false false false false false false false false false 1 false true false false 74000000 74000000 false false false 2 false true false false 72000000 72000000 false false false 3 false true false false 221000000 221000000 false false false 4 false true false false 209000000 209000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents the research and development expenses recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. No authoritative reference available. false 27 Selling, general and administrative 2 qcom_SellingGeneralAndAdministrative qcom false na duration This element represents the selling, general and administrative expenses recognized during the period arising from... false false false false false false false false false false false false 1 false true false false 65000000 65000000 false false false 2 false true false false 68000000 68000000 false false false 3 false true false false 202000000 202000000 false false false 4 false true false false 197000000 197000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents the selling, general and administrative expenses recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. No authoritative reference available. false 28 Share-based compensation expense before income taxes 2 us-gaap_AllocatedShareBasedCompensationExpense 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 149000000 149000000 false false false 2 false true false false 151000000 151000000 false false false 3 false true false false 453000000 453000000 false false false 4 false true false false 436000000 436000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F false 29 Related income tax benefit 2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false -38000000 -38000000 false false false 2 false true false false -24000000 -24000000 false false false 3 false true false false -131000000 -131000000 false false false 4 false true false false -66000000 -66000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary The total recognized tax benefit related to compensation cost for share-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) false 30 Share-based compensation expense, net of income taxes 2 qcom_ShareBasedCompensationExpenseNetOfIncomeTaxes qcom false na duration Represents the expense recognized during the period, net of tax, arising from share-based compensation arrangements (for... false false false false false false false false false false false totallabel false 1 false true false false 111000000 111000000 false false false 2 false true false false 127000000 127000000 false false false 3 false true false false 322000000 322000000 false false false 4 false true false false 370000000 370000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Represents the expense recognized during the period, net of tax, arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees No authoritative reference available. true 31 Share-based compensation expense related to share-based award 2 qcom_ShareBasedCompensationExpenseRelatedToShareBasedAward qcom false debit duration Represents the expense recognized during the period arising from share-based awards granted in the period (for example,... false false false false false false 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 3 false true false false 73000000 73000000 false false false 4 false true false false 68000000 68000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Represents the expense recognized during the period arising from share-based awards granted in the period (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. No authoritative reference available. false 32 Incremental tax benefit from stock options exercised 2 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities us-gaap true debit duration No definition available. false false false false false false 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 3 false true false false 34000000 34000000 false false false 4 false true false false 54000000 54000000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-15 -Paragraph 3 false 33 Total unrecognized compensation cost related to non-vested stock options 2 us-gaap_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwards 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 1200000000 1200000000 false false false 2 false false false false 0 0 false false false 3 false true false false 1200000000 1200000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h false 34 Weighted-average period (years) that unrecognized compensation cost is expected to be recognized 2 us-gaap_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsWeightedAveragePeriodOfRecognition us-gaap true na duration No definition available. false false false false false false false false false false false label false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 2.9 2.9 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:decimalItemType decimal The weighted average period over which unrecognized share-based compensation costs are expected to be reported. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h false 35 Net stock options granted, after forfeitures and cancellations, as a percent of outstanding shares as of the beginning of each fiscal period 2 qcom_NetStockOptionsAfterForfeituresAndCancellationsPercentOfOutstandingShares qcom false na duration This element represents the net stock options (after forfeitures and cancellations) granted during the fiscal period as a... false false false false false false 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 3 false true false false 1.3 1.3 false false false 4 false true false false 2.2 2.2 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false us-types:percentItemType pure This element represents the net stock options (after forfeitures and cancellations) granted during the fiscal period as a percentage of outstanding shares as of the beginning of the fiscal period. No authoritative reference available. false 36 Total stock options granted as a percent of outstanding shares as of the end of each fiscal period 2 qcom_TotalStockOptionsGrantedPercentOfOutstandingShares qcom false na duration This element represents the total stock options granted during the fiscal period as a percentage of outstanding shares as of... false false false false false false 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 3 false true false false 1.8 1.8 false false false 4 false true false false 2.4 2.4 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false us-types:percentItemType pure This element represents the total stock options granted during the fiscal period as a percentage of outstanding shares as of the end of the fiscal period. No authoritative reference available. false 37 Grant of employee restricted stocks 2 qcom_GrantOfEmployeeRestrictedStocks qcom false na duration The number of awards granted during the period under a share-based award plan other than stock option plans (for example,... false false false false false false false false false false false false 1 false true false false 5569000 5569000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:sharesItemType shares The number of awards granted during the period under a share-based award plan other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan). No authoritative reference available. false 38 Vesting period employee restricted stock units 2 qcom_VestingPeriodEmployeeRestrictedStockUnits qcom false na duration This element represents the vesting period of the employee restricted stock units false false false false false false false false false false false false 1 false false false false 0 0 three years false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string This element represents the vesting period of the employee restricted stock units No authoritative reference available. false 39 Weighted-average fair value - employee restricted stock units 2 qcom_WeightedAverageFairValueEmployeeRestrictedStockUnits qcom false na duration This element represents the weighted-average estimated fair value of employee restricted stock units granted during the... false false false false false false 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 3 false true false false 35.59 35.59 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents the weighted-average estimated fair value of employee restricted stock units granted during the period. No authoritative reference available. false 40 Unvested employee restricted stock units 2 qcom_UnvestedEmployeeRestrictedStockUnits qcom false na instant This element represents the number of unvested employee resticted stock units as of the end of the period. false false false false false false false false false false false false 1 false true false false 5551000 5551000 false false false 2 false false false false 0 0 false false false 3 false true false false 5551000 5551000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:sharesItemType shares This element represents the number of unvested employee resticted stock units as of the end of the period. No authoritative reference available. false 41 Total unrecognized compensation cost - non-vested employee restricted stock units 2 qcom_TotalUnrecognizedCompensationCostNonVestedEmployeeRestrictedStockUnits qcom false na instant This element represents the total unrecognized estimated compensation costs related to non-vested employee restricted stock... false false false false false false false false false false false terselabel false 1 true true false false 176000000 176000000 false false false 2 false false false false 0 0 false false false 3 true true false false 176000000 176000000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents the total unrecognized estimated compensation costs related to non-vested employee restricted stock units granted prior to the end of the period. No authoritative reference available. false 42 Weighted-average recognition period - non-vested employee restricted stock units 2 qcom_WeightedAverageRecognitionPeriodNonVestedEmployeeRestrictedStockUnits qcom false na instant This element represents the weighted-average period over which the total unrecognized estimated compensation related to... false false false false false false false false false false false terselabel false 1 false false false false 0 0 2.9 years false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 2.9 years false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string This element represents the weighted-average period over which the total unrecognized estimated compensation related to non-vested employee restricted stock units is expected to be recognized. No authoritative reference available. false 43 Anti-dilutive employee stock options 0 na true na na No definition available. false true false false false false false false false false false http://qualcomm.com/role/basisofpresentationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false false 7 true false false false Anti-dilutive employee stock options us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_StockOptionsMember us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis explicitMember u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 false 8 true false false false Anti-dilutive employee stock options us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_StockOptionsMember us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis explicitMember u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 false 9 true false false false Anti-dilutive employee stock options us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_StockOptionsMember us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis explicitMember u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 false 10 true false false false Anti-dilutive employee stock options us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_StockOptionsMember us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis explicitMember u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 na No definition available. No authoritative reference available. false 47 Antidilutive Securities 2 us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 48 Antidilutive securities excluded from computation of EPS 2 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 163146000 163146000 false false false 2 false true false false 134515000 134515000 false false false 3 false true false false 145464000 145464000 false false false 4 false true false false 149528000 149528000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:sharesItemType shares Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 13, 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c false 85 Anti-dilutive performance-based stock units issued 0 na true na na No definition available. false true false false false false false false false false false http://qualcomm.com/role/basisofpresentationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false false 11 true false false false Anti-dilutive performance-based stock units issued us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_StockCompensationPlanMember us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis explicitMember u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 false 12 true false false false Anti-dilutive performance-based stock units issued us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_StockCompensationPlanMember us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis explicitMember u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 na No definition available. No authoritative reference available. false 89 Antidilutive Securities 2 us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract 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 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 90 Antidilutive securities excluded from computation of EPS 2 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 574000 574000 false false false 2 false false false false 0 0 false false false 3 false true false false 314000 314000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false xbrli:sharesItemType shares Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 13, 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c false 6 45 false NoRounding NoRounding UnKnown true true