Segments - Reconciliation of Segment EBITDA to Consolidated Net Income (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Segment EBITDA	$ 253		$ 243		$ 802	$ 748
Corporate expense and other items, net	(3)		(3)		(9)	(14)
Depreciation	(82)		(63)		(235)	(187)
Amortization	(4)		(3)		(12)	(8)
Non-service cost components of pension and OPEB costs	(4)		(3)		(19)	(10)
Pension settlement charge	(2)	$ (258)			(260)
Restructuring charges, net	(5)		(9)		(23)	(17)
Stock compensation expense	(5)		(4)		(15)	(13)
Strategic transaction expenses, net of transaction breakup fee income	(8)		(6)		(32)	(13)
Acquisition related inventory adjustments	(3)				(12)
Non-income tax legal judgment					6
Other items			(5)		(9)	(10)
Impairment of indefinite-lived intangible asset						(20)
Adjustment in fair value of disposal group held for sale				$ 3		3	$ (27)
Earnings before interest and income taxes	137		147		182	459
Interest expense	31		24		92	71
Interest income	3		3		8	8
Earnings before income taxes	109		126		98	396
Income tax expense (benefit)	5		31		(27)	75
Equity in earnings of affiliates	8		1		22	13
Net income	$ 112		$ 96		$ 147	$ 334