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
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets:	$ 53,133us-gaap_AssetsFairValueDisclosureRecurring	$ 50,443us-gaap_AssetsFairValueDisclosureRecurring
Cash equivalents: | Money market funds
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets:	2,307us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember	4,935us-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:	1us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember	0us-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:	29,422us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember	31,734us-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:	3,262us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	1,063us-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:	1,186us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember	861us-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:	13,394us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember	9,159us-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:	1,362us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember	579us-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:	1,923us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember	1,952us-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:	276us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember	160us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Derivative liabilities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities:	131us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember	67us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Level 1
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets:	4,230us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	6,887us-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:	2,307us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	4,935us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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:	1,923us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	1,952us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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:	0us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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:	48,902us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	43,554us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-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:	1us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-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:	29,422us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	31,734us-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:	3,262us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	1,063us-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:	1,186us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	861us-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:	13,394us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	9,159us-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:	1,362us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	579us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-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:	275us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	158us-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:	131us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	67us-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:	1us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	2us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CashEquivalentsMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-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:	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-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]
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Level 3 | Available-for-sale investments: | U.S. agency mortgage-backed securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
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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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