Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 401	$ 549	$ 330
Other comprehensive (loss) income, before tax:
Foreign currency translation adjustment	28	(85)	79
Net change in derivative hedge agreements:
Unrealized (loss) gain	(14)	(8)	9
Amount of loss (gain) reclassified into net income	12	4	(5)
Net change in postretirement benefit plans:
Net loss	(83)	(37)	(19)
Prior service credit	0	0	1
Amortization of prior service credit cost	(4)	(4)	(3)
Amortization of net actuarial loss into net income	12	13	13
Settlement	9	1	1
Foreign currency translation adjustment	(3)	15	(18)
Other comprehensive (loss) income, before tax	(43)	(101)	58
Income tax (benefit) expense related to other comprehensive loss	(5)	10	(50)
Other comprehensive (loss) income, net of tax	(38)	(111)	108
Comprehensive income	363	438	438
Less: comprehensive gain (loss) attributable to noncontrolling interests	1	(2)	0
Comprehensive income	$ 362	$ 440	$ 438