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Derivative Financial Instruments - Schedule of Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative Asset [Abstract]    
Derivatives accounted for as cash flow hedges $ 104us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue [1] $ 271us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue [1]
Non-qualifying hedge activities 20us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue [1] 24us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue [1]
Total Derivative Financial Assets 291us-gaap_DerivativeFairValueOfDerivativeAsset [1] 1,107us-gaap_DerivativeFairValueOfDerivativeAsset [1]
Less: Gross amounts offset in the balance sheet 291us-gaap_DerivativeAssetFairValueGrossLiability [1],[2] 1,107us-gaap_DerivativeAssetFairValueGrossLiability [1],[2]
Net amounts of derivative financial assets and liabilities presented in the balance sheet 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral [1],[3] 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral [1],[3]
Derivative Liability [Abstract]    
Derivatives accounted for as cash flow hedges (207)us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue [1] (166)us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue [1]
Derivatives not designated as hedging instruments (379)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue [1] (171)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue [1]
Total Derivative Financial Liabilities (586)us-gaap_DerivativeFairValueOfDerivativeLiability [1] (337)us-gaap_DerivativeFairValueOfDerivativeLiability [1]
Less: Gross amounts offset in the balance sheet (504)us-gaap_DerivativeLiabilityFairValueGrossAsset [1],[2] (337)us-gaap_DerivativeLiabilityFairValueGrossAsset [1],[2]
Net amounts of derivative financial assets and liabilities presented in the balance sheet (82)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral [1],[3] 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral [1],[3]
Debt [Member]    
Derivative Asset [Abstract]    
Non-qualifying hedge activities 167us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember		 [1] 812us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember		 [1]
Derivative Liability [Abstract]    
Derivatives not designated as hedging instruments 0us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember		 [1] 0us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember		 [1]
Interest rate swaps [Member]    
Derivative Asset [Abstract]    
Derivatives accounted for as cash flow hedges 7us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] 16us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
Non-qualifying hedge activities 20us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] 24us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
Derivative Liability [Abstract]    
Derivatives accounted for as cash flow hedges (74)us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] (138)us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
Derivatives not designated as hedging instruments (379)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] (171)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
Interest rate swaps [Member] | Debt [Member]    
Derivative Asset [Abstract]    
Non-qualifying hedge activities 117us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] 270us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
Derivative Liability [Abstract]    
Derivatives not designated as hedging instruments 0us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] 0us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
Currency swaps [Member]    
Derivative Asset [Abstract]    
Derivatives accounted for as cash flow hedges 97us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1] 255us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1]
Derivative Liability [Abstract]    
Derivatives accounted for as cash flow hedges (133)us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1] (28)us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1]
Currency swaps [Member] | Debt [Member]    
Derivative Asset [Abstract]    
Non-qualifying hedge activities 50us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1] 542us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1]
Derivative Liability [Abstract]    
Derivatives not designated as hedging instruments $ 0us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1] $ 0us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DebtMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1]
[1] All of our derivatives are bilateral over-the-counter ("OTC") derivatives.
[2] Represents the netting of derivative receivable and payable balances for the same counterparty under an enforceable netting agreement. Gross amounts offset in the balance sheet includes cash collateral paid as of December 31, 2014 of $213 million and collateral received as of December 31, 2013 of $811 million. At December 31, 2014 and December 31, 2013, we did not have any financial instrument collateral received/posted.
[3] At December 31, 2014 and December 31, 2013, we had not received any cash or financial instruments not subject to an enforceable master netting agreement.