Derivative Instruments - Additional Information (Details) $ in Millions	6 Months Ended
Jun. 30, 2019 USD ($) tranche	Jul. 31, 2014 USD ($)
Derivative [Line Items]
Net derivative gains to be reclassified into earnings within the next 12 months	$ 36
Offset asset	29
Offset liability	0
Net derivative assets	43
Net derivative liabilities	$ 11
Foreign Exchange Contract \| Designated as Hedging Instrument \| Minimum
Derivative [Line Items]
Derivative contract duration	1 month
Foreign Exchange Contract \| Designated as Hedging Instrument \| Maximum
Derivative [Line Items]
Derivative contract duration	1 year
Foreign Exchange Contract \| Designated as Hedging Instrument \| Maximum \| Cash Flow Hedging
Derivative [Line Items]
Derivative contract duration	18 months
Interest Rate Swap \| Designated as Hedging Instrument \| Fair Value Hedging
Derivative [Line Items]
Derivative liability	$ 2,400	$ 2,400
Warrant
Derivative [Line Items]
Maximum percentage of acquired shares	5.00%
Warrants term	7 years
Number of tranches \| tranche	4
Maximum number of tranches that can vest per year \| tranche	2

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

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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.

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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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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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