Restructuring and Other Charges - Schedule of Restructuring and Other Charges (Details) - USD ($)		12 Months Ended
	Nov. 01, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Asset impairments	$ 0	$ 13,000,000	$ 58,000,000	$ 80,000,000
Layoff costs		20,000,000	64,000,000	68,000,000
Pension and Other postretirement benefits - net settlement and curtailment charges		91,000,000	0	2,000,000
Net (gain) loss on divestitures of assets and businesses (T)		(109,000,000)	57,000,000	3,000,000
Other		13,000,000	(3,000,000)	27,000,000
Reversals of previously recorded layoff costs		(19,000,000)	(11,000,000)	(25,000,000)
Restructuring and other charges		$ 9,000,000	$ 165,000,000	$ 155,000,000