2.2.0.7 false Income Taxes (Details) (USD $) 009060 - Disclosure - Income Taxes (Details) true false In Millions 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 $ false 2 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 $ 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 $ 2 Notes to Financial Statements [Abstract] 0 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 xbrli:stringItemType string No definition available. false 3 Annual effective income tax rate (percentage) 1 us-gaap_EffectiveIncomeTaxRateContinuingOperations us-gaap true na duration No definition available. 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 true false false 20 20 false false false 3 false true false false 23 23 false false false us-types:percentItemType pure A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 false 4 Tax expense related to Nokia deferred revenue 1 qcom_TaxExpenseRelatedToNokiaDeferredRevenue qcom false debit duration This element represents tax expense arising from deferred revenue that is taxable in fiscal 2010, but for which the resulting... false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 true true false false 130000000 130 false false false 3 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents tax expense arising from deferred revenue that is taxable in fiscal 2010, but for which the resulting deferred tax asset will reverse in future years when the state tax rate will be lower. No authoritative reference available. false 5 Tax benefit related to foreign earnings 1 us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 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 false false false 2 false true false false 22 22 false false false 3 false false false false 0 0 false false false us-types:percentItemType pure The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period. No authoritative reference available. false 6 State taxes (percentage) 1 us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes us-gaap true na duration No definition available. 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 true false false 5 5 false false false 3 false false false false 0 0 false false false us-types:percentItemType pure The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense (benefit), net of the federal tax benefit (expense) thereon, recorded during the period. No authoritative reference available. false 7 Deferred revenue at different rates (percentage) 1 qcom_DeferredRevenueAtDifferentRates qcom false na duration The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can... 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 true false false 4 4 false false false 3 false false false false 0 0 false false false us-types:percentItemType pure The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by deferred revenue that is taxable in fiscal 2010, but for which the resulting deferred tax asset wil reverse in future years when the state tax rate will be lower. No authoritative reference available. false 8 IRS tax settlement 1 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 true true false false 20000000 20 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false xbrli:monetaryItemType monetary Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 10A, 10B, 10C Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 10 -Subparagraph b false 3 7 false Millions UnKnown UnKnown false true