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Derivative Financial Instruments Table of Offsetting Derivative Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivative Asset [Abstract]    
Gross Amounts of Recognized Assets $ 607us-gaap_DerivativeFairValueOfDerivativeAsset $ 349us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Offset in the Condensed Consolidated Balance Sheet 0gild_DerivativeAssetFairValueGrossAssetCollateralAndOtherSetOffAgainstGrossAssetsSubjectToOffsettingEnforceableMasterNettingArrangementOrSimilarAgreement 0gild_DerivativeAssetFairValueGrossAssetCollateralAndOtherSetOffAgainstGrossAssetsSubjectToOffsettingEnforceableMasterNettingArrangementOrSimilarAgreement
Amount of Assets Presented in the Condensed Consolidated Balance Sheet 607us-gaap_DerivativeAssets 349us-gaap_DerivativeAssets
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Derivative Financial Instruments (9)gild_DerivativeAssetFinancialInstrumentsSubjectToMasterNettingArrangementOrSimilarAgreementElectedNotToBeOffset 0gild_DerivativeAssetFinancialInstrumentsSubjectToMasterNettingArrangementOrSimilarAgreementElectedNotToBeOffset
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received/Pledged 0us-gaap_DerivativeCollateralObligationToReturnCash 0us-gaap_DerivativeCollateralObligationToReturnCash
Net Amount (Legal Offset) 598us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 349us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Derivative Liability [Abstract]    
Gross Amount of Recognized Liabilities (9)us-gaap_DerivativeFairValueOfDerivativeLiability 0us-gaap_DerivativeFairValueOfDerivativeLiability
Gross Amounts Offset in the Condensed Consolidated Balance Sheet 0gild_DerivativeLiabilityFairValueGrossLiabilityCollateralAndOtherSetOffAgainstGrossAssetsSubjectToOffsettingEnforceableMasterNettingArrangementOrSimilarAgreement 0gild_DerivativeLiabilityFairValueGrossLiabilityCollateralAndOtherSetOffAgainstGrossAssetsSubjectToOffsettingEnforceableMasterNettingArrangementOrSimilarAgreement
Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet 9us-gaap_DerivativeLiabilities 0us-gaap_DerivativeLiabilities
Gross Amount Not Offset in the Condensed Consolidated Balance Sheet - Derivative Financial Instruments 9gild_DerivativeLiabilityFinancialInstrumentsSubjectToMasterNettingArrangementOrSimilarAgreementElectedNotToBeOffset 0gild_DerivativeLiabilityFinancialInstrumentsSubjectToMasterNettingArrangementOrSimilarAgreementElectedNotToBeOffset
Gross Amount Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received/Pledged 0us-gaap_DerivativeCollateralRightToReclaimCash 0us-gaap_DerivativeCollateralRightToReclaimCash
Net Amount (Legal Offset) $ 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral $ 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral