Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Derivative Instruments (Forward Currency Exchange Contracts) (Details) - Foreign currency exchange forward contracts $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Nov. 30, 2018 EUR (€)
Derivative [Line Items]
Notional amount	$ 6,336	$ 5,871
Maximum term	586 days	548 days
Derivative, fair value, net	$ 57	$ (21)
Other current assets
Derivative [Line Items]
Derivative asset	43	15
Other noncurrent assets
Derivative [Line Items]
Derivative asset	34	1
Other current liabilities
Derivative [Line Items]
Derivative liability	(20)	(36)
Other noncurrent liabilities
Derivative [Line Items]
Derivative liability	0	(1)
Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	870	1,104	€ 2,250,000,000
Derivative, fair value, net	11	4
Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative asset	15	11
Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative asset	1	1
Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liability	(5)	(7)
Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liability	0	(1)
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	5,466	4,767
Derivative, fair value, net	46	(25)
Not Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative asset	28	4
Not Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative asset	33	0
Not Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liability	(15)	(29)
Not Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liability	$ 0	$ 0