Other (Loss) Income, Net (Schedule of Foreign Exchange Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Foreign Currency Exchange Gain (Loss) [Line Items]
Net exchange (losses) gains	$ (140)	$ (15)	$ (199)	$ (136)
Net exchange (losses) gains, tax	125	(2)	191	66
Net exchange (losses) gains, after-tax	(15)	(17)	(8)	(70)
Subsidiary Monetary Position Gain (Loss) [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Net exchange (losses) gains	(54)	146	(28)	179
Net exchange (losses) gains, tax	94	(60)	130	(47)
Net exchange (losses) gains, after-tax	40	86	102	132
Hedging Program Gain (Loss) [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Net exchange (losses) gains	(86)	(161)	(171)	(315)
Net exchange (losses) gains, tax	31	58	61	113
Net exchange (losses) gains, after-tax	$ (55)	$ (103)	$ (110)	$ (202)