Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]
AOCI, Post-employment benefits, net of tax	$ (52)		$ (47)
AOCI, Translation adjustments and other, net of tax	(39)		(38)
Accumulated other comprehensive loss, net of tax	(91)		$ (85)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	0
Other comprehensive income, translation adjustments and other, before reclassificaitons, net of tax	(1)
Other comprehensive income, before reclassifications to income, net of tax	(1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	1
Reclassificaion of translation adjustments and other in AOCI into earnings, net of tax	0
Other comprehensive income, portion representing reclassificaitons to earnings, net of tax	1
Post-retirement benefits	1	$ 11
Translation adjustments and other	(1)	33
Other comprehensive loss	0	$ 43
Elimination of stranded tax effects resulting from tax legislation, Defined benefit plan	(6)
Elimination of stranded tax effects resulting from tax legislation	(6)
Elimination of stranded tax effects resulting from tax legislation, translation adjustments and other	$ 0