Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 79	$ 79
Other comprehensive income, before tax:
Foreign currency translation adjustment	29	8
Net change in derivative hedge agreements:
Unrealized loss	(9)	0
Amount of loss (gain) reclassified into net income	2	(1)
Net change in postretirement benefit plans:
Amortization of prior service credit	(1)	(1)
Amortization of net actuarial loss into net income	3	3
Settlement/Curtailment	0	1
Other comprehensive income, before tax	24	10
Income tax expense (benefit) related to items of other comprehensive income	4	(10)
Other comprehensive income, net of tax	20	20
Comprehensive income	$ 99	$ 99