Consolidated Statement Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 116	$ 653	$ 180
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Currency translation adjustments	(14)	(41)	(186)
Hedging gains and losses	(30)	(30)	5
Investment and other gains and losses	2	(2)	(3)
Defined benefit plans	(6)	(39)	3
Other comprehensive loss	(48)	(112)	(181)
Total comprehensive income (loss)	68	541	(1)
Less: Comprehensive income attributable to noncontrolling interests	(17)	(11)	(17)
Less: Comprehensive loss attributable to redeemable noncontrolling interests	2
Comprehensive income (loss) attributable to the parent company	$ 53	$ 530	$ (18)