Derivative Instruments - Additional Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) tranche	Jul. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Net derivative gain reclassified into earnings within next 12 months	$ 64
Offset asset	30
Offset liability	0
Net derivative assets	84
Net derivative liabilities	$ 1
Warrant
Derivatives, Fair Value [Line Items]
Percent of shares acquirable	5.00%
Term	7 years
Number of tranches \| tranche	4
Maximum number of tranches vesting per year \| tranche	2
Fair Value Hedging \| Designated as Hedging Instrument \| Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative liability	$ 2,400	$ 2,400
Minimum \| Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Derivative maturity	1 month
Maximum \| Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Derivative maturity	1 year
Maximum \| Cash Flow Hedging \| Designated as Hedging Instrument \| Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Derivative maturity	18 months

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Derivatives, Maximum Number of Tranches Vesting per Year

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Derivatives, Number of Tranches

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- Definition

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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