Segments - Reconciliation of Segment EBITDA to Consolidated Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Segment EBITDA	$ 290	$ 251	$ 549	$ 505
Corporate expense and other items, net	(4)	(5)	(6)	(11)
Depreciation	(80)	(60)	(153)	(124)
Amortization	(5)	(2)	(8)	(5)
Non-service cost components of pension and OPEB costs	(9)	(4)	(15)	(7)
Pension settlement charge	(258)		(258)
Restructuring charges, net	(9)	(7)	(18)	(8)
Stock compensation expense	(5)	(5)	(10)	(9)
Strategic transaction expenses, net of transaction breakup fee income	(11)	(8)	(24)	(7)
Acquisition related inventory adjustments	(5)		(9)
Non-income tax legal judgment			6
Other items	1	(5)	(9)	(5)
Impairment of indefinite-lived intangible asset		20		20
Adjustment in fair value of disposal group held for sale		3		3	$ (27)
Earnings (loss) before interest and income taxes	(95)	138	45	312
Interest expense	34	23	61	47
Interest income	3	2	5	5
Earnings (loss) before income taxes	(126)	117	(11)	270
Income tax expense (benefit)	(52)	(4)	(32)	44
Equity in earnings of affiliates	8	6	14	12
Net income (loss)	$ (66)	$ 127	$ 35	$ 238