Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 36	$ 74	$ 91	$ 141
Derivatives qualifying as cash flow hedges:
(Loss) gain on derivatives qualifying as cash flow hedges, net of tax (benefit) of ($2), $3, ($5) and $0, respectively	(2)	4	(8)	(4)
Less: Reclassification adjustment for loss on derivatives included in net income, net of tax (benefit) of $0, ($1), $0 and ($2), respectively	(1)	(2)	(1)	(4)
Net derivatives qualifying as cash flow hedges	(1)	6	(7)	0
Pension and postretirement benefits:
Changes in pension and postretirement benefits, net of tax (benefit) of $2, ($2), $2 and ($3), respectively	4	(3)	3	(6)
Less: Amortization of prior service cost included in net periodic pension cost, net of tax (benefit) of ($7), ($1), ($7) and ($1), respectively	(12)	(1)	(12)	(1)
Net pension and postretirement benefits	16	(2)	15	(5)
Foreign currency translation:
Changes in foreign currency translation, net of tax benefit of $0 in all periods	8	(36)	48	(12)
Other comprehensive income (loss), net of tax	23	(32)	56	(17)
Comprehensive income	$ 59	$ 42	$ 147	$ 124