v2.4.1.9

Fair Value (Assets and Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified | Apr. 25, 2015 | Jul. 26, 2014
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Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | $ 53,133 us-gaap_AssetsFairValueDisclosureRecurring | $ 50,443 us-gaap_AssetsFairValueDisclosureRecurring
Cash equivalents: | Money market funds |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 2,307 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember | 4,935 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember
Cash equivalents: | Corporate debt securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale investments: | U.S. government securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 29,422 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember | 31,734 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember
Available-for-sale investments: | U.S. government agency securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 3,262 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 1,063 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale investments: | Non-U.S. government and agency securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1,186 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 861 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale investments: | Corporate debt securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 13,394 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember | 9,159 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale investments: | U.S. agency mortgage-backed securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1,362 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 579 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available-for-sale investments: | Publicly traded equity securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1,923 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember | 1,952 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember
Derivative assets |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 276 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember | 160 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative liabilities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities: | 131 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember | 67 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Level 1 |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 4,230 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 6,887 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Cash equivalents: | Money market funds |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 2,307 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 4,935 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Cash equivalents: | Corporate debt securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Available-for-sale investments: | U.S. government securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Available-for-sale investments: | U.S. government agency securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Available-for-sale investments: | Non-U.S. government and agency securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Available-for-sale investments: | Corporate debt securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Available-for-sale investments: | U.S. agency mortgage-backed securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Available-for-sale investments: | Publicly traded equity securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1,923 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,952 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Derivative assets |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Derivative liabilities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities: | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2 |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 48,902 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 43,554 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Cash equivalents: | Money market funds |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Cash equivalents: | Corporate debt securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Available-for-sale investments: | U.S. government securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 29,422 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 31,734 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Available-for-sale investments: | U.S. government agency securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 3,262 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,063 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Available-for-sale investments: | Non-U.S. government and agency securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1,186 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 861 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Available-for-sale investments: | Corporate debt securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 13,394 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 9,159 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Available-for-sale investments: | U.S. agency mortgage-backed securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1,362 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 579 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Available-for-sale investments: | Publicly traded equity securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Derivative assets |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 275 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 158 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Derivative liabilities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities: | 131 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 67 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 3 |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 1 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 2 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Cash equivalents: | Money market funds |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Cash equivalents: | Corporate debt securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Available-for-sale investments: | U.S. government securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Available-for-sale investments: | U.S. government agency securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Available-for-sale investments: | Non-U.S. government and agency securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
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Level 3 | Available-for-sale investments: | Corporate debt securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Available-for-sale investments: | U.S. agency mortgage-backed securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets: | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Available-for-sale investments: | Publicly traded equity securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
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Level 3 | Derivative assets |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
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Level 3 | Derivative liabilities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
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