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Hedging Activities (Summary of Notional Amounts and Respective Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Notional amount		$ 13,913	$ 14,911
Asset derivatives, fair value		168	148
Liability derivatives, fair value		(280)	(442)
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member]
Notional amount	[1]	336	391
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Asset derivatives, fair value	[1]	7	4
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Asset derivatives, fair value		5	2
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Liability derivatives, fair value	[1]		(2)
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]
Notional amount		937	900
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Asset derivatives, fair value		2	5
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Liability derivatives, fair value		(1)	(7)
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member]
Notional amount		12,640	13,620
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Asset derivatives, fair value		116	94
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Asset derivatives, fair value		38	43
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Liability derivatives, fair value		(42)	(47)
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Liability derivatives, fair value		$ (237)	$ (386)
[1] Cash flow hedges with a typical duration of 24 months or less.

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

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