Derivative Instruments - Additional Information (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($) tranche	Jul. 31, 2014 USD ($)
Derivative [Line Items]
Net derivative gains to be reclassified into earnings within the next 12 months	$ 44
Offset asset	45
Offset liability	25
Net derivative assets	105
Net derivative liabilities	$ 0
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 shares acquirable	5.00%
Number of tranches \| tranche	4
Derivative contract duration	7 years
Maximum number of tranches that can vest per year \| tranche	2

Derivatives, Maximum Number of Tranches Vesting per Year

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Warrants, Percentage of Acquiree Shares, Maximum

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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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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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