Derivative Instruments - Additional Information (Details) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($) tranche	Jul. 31, 2014 USD ($)
Derivative [Line Items]
Net derivative gains to be reclassified into earnings within the next 12 months	$ 33
Offset asset	14
Offset liability	25
Net derivative assets	73
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

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