Marketable Securities (Details) (USD $)
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3 Months Ended |
6 Months Ended |
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Mar. 29, 2015
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Mar. 30, 2014
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Mar. 30, 2014
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Sep. 28, 2014
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Apr. 21, 2015
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Schedule of Marketable Securities [Line Items] |
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Restricted Cash and Cash Equivalents, Current |
$ 24,000,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
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Total marketable securities - Current |
10,063,000,000us-gaap_MarketableSecuritiesCurrent
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9,658,000,000us-gaap_MarketableSecuritiesCurrent
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Total marketable securities - Noncurrent |
14,055,000,000us-gaap_MarketableSecuritiesNoncurrent
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14,457,000,000us-gaap_MarketableSecuritiesNoncurrent
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Trading Securities [Abstract] |
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Trading - Current |
515,000,000us-gaap_TradingSecurities
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511,000,000us-gaap_TradingSecurities
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Trading - Noncurrent |
608,000,000qcom_TradingSecuritiesNoncurrent
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642,000,000qcom_TradingSecuritiesNoncurrent
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Available-for-sale Securities [Abstract] |
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Available-for-sale - Current |
9,548,000,000us-gaap_AvailableForSaleSecuritiesCurrent
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9,147,000,000us-gaap_AvailableForSaleSecuritiesCurrent
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Available-for-sale - Noncurrent |
12,659,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent
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13,025,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent
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Fair Value Option [Abstract] |
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Effective ownership interest in debt fund (fair value option) |
27.00%qcom_EffectiveOwnershipInterestInDebtMutualFundFairValueOption
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(Decrease) increase in fair value recognized in investment income |
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12,000,000us-gaap_FairValueOptionChangesInFairValueGainLoss1
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18,000,000us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Net gains recognized on debt securities classified as trading held at the end of the period |
14,000,000us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
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U.S. Treasury securities and government-related securities [Member] |
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Schedule of Marketable Securities [Line Items] |
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Restricted Marketable Securities |
140,000,000qcom_RestrictedMarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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Trading Securities [Abstract] |
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Trading - Current |
338,000,000us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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320,000,000us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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Trading - Noncurrent |
23,000,000qcom_TradingSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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38,000,000qcom_TradingSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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Available-for-sale Securities [Abstract] |
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Available-for-sale - Current |
385,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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805,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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Available-for-sale - Noncurrent |
715,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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392,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember
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Corporate bonds and notes |
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Schedule of Marketable Securities [Line Items] |
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Restricted Marketable Securities |
2,900,000,000qcom_RestrictedMarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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Trading Securities [Abstract] |
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Trading - Current |
177,000,000us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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191,000,000us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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Trading - Noncurrent |
345,000,000qcom_TradingSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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367,000,000qcom_TradingSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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Available-for-sale Securities [Abstract] |
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Available-for-sale - Current |
7,250,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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6,274,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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Available-for-sale - Noncurrent |
7,668,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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7,649,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
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Mortgage- and asset-backed securities [Member] |
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Schedule of Marketable Securities [Line Items] |
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Restricted Marketable Securities |
717,000,000qcom_RestrictedMarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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Trading Securities [Abstract] |
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Trading - Current |
0us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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0us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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Trading - Noncurrent |
240,000,000qcom_TradingSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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237,000,000qcom_TradingSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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Available-for-sale Securities [Abstract] |
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Available-for-sale - Current |
1,091,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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1,063,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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Available-for-sale - Noncurrent |
205,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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195,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
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Auction rate securities |
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Available-for-sale Securities [Abstract] |
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Available-for-sale - Current |
0us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
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0us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
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Available-for-sale - Noncurrent |
47,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
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83,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
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Common and preferred stock |
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Available-for-sale Securities [Abstract] |
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Available-for-sale - Current |
572,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = qcom_CommonAndPreferredStockMember
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192,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = qcom_CommonAndPreferredStockMember
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Available-for-sale - Noncurrent |
819,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = qcom_CommonAndPreferredStockMember
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1,605,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = qcom_CommonAndPreferredStockMember
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Equity funds |
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Available-for-sale Securities [Abstract] |
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Available-for-sale - Current |
0us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquityFundsMember
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0us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquityFundsMember
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Available-for-sale - Noncurrent |
646,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquityFundsMember
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541,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquityFundsMember
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Debt funds |
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Available-for-sale Securities [Abstract] |
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Available-for-sale - Current |
250,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
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813,000,000us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
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Available-for-sale - Noncurrent |
2,559,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
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2,560,000,000us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
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Fair Value Option [Abstract] |
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Fair value option - Current |
0us-gaap_OtherMarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
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0us-gaap_OtherMarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
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Fair value option - Noncurrent |
788,000,000us-gaap_OtherMarketableSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
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790,000,000us-gaap_OtherMarketableSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
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Subsequent Event [Member] |
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Schedule of Marketable Securities [Line Items] |
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Foreign Currency Exchange Rate, Remeasurement |
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1.4929us-gaap_ForeignCurrencyExchangeRateRemeasurement1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
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Subsequent Event [Member] | United Kingdom, Pounds |
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Schedule of Marketable Securities [Line Items] |
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Threshold To Set Aside Marketable Securities |
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1,900,000,000qcom_ThresholdToSetAsideMarketableSecurities / us-gaap_CurrencyAxis = currency_GBP / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
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Subsequent Event [Member] | United States of America, Dollars |
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Schedule of Marketable Securities [Line Items] |
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Threshold To Set Aside Marketable Securities |
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2,800,000,000qcom_ThresholdToSetAsideMarketableSecurities / us-gaap_CurrencyAxis = currency_USD / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
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