Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 59	$ 66	$ 154	$ 157
Derivatives qualifying as cash flow hedges:
Gain (loss) on derivatives qualifying as cash flow hedges, net of tax (benefit) of $0, ($2), $0 and ($7), respectively	(1)	(3)	1	(11)
Less: Reclassification adjustment for loss on derivatives included in net income, net of tax (benefit) of $0, ($1), $0, ($1), respectively	(1)	0	(3)	(1)
Net derivatives qualifying as cash flow hedges	0	(3)	4	(10)
Pension and postretirement benefits:
Changes in pension and postretirement benefits, net of tax (benefit) of $0, ($10), $0 and ($8), respectively	(1)	(15)	2	(12)
Less: Amortization of prior service cost included in net periodic pension cost, net of tax (benefit) of ($1), ($2), ($2) and ($9), respectively	(1)	(1)	(4)	(13)
Net pension and postretirement benefits	0	(14)	6	1
Foreign currency translation:
Changes in foreign currency translation, net of tax of $0 in all periods	4	10	(22)	58
Less: Translation loss realized upon sale of foreign equity method investment, net of tax (benefit) of $0, $0, ($2) and $0, respectively	0	0	(4)	0
Net foreign currency translation	4	10	(18)	58
Other comprehensive income, net of tax	4	(7)	(8)	49
Comprehensive income	$ 63	$ 59	$ 146	$ 206