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Geographic and Segment Information - Reconciliation of Segment Adjusted EBITDA from Segments to Consolidated Net Income (Loss) Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Adjusted EBITDA									$ 1,163	$ 1,902	$ 1,588
Corporate and Other Adjusted EBITDA									(143)	(162)	(166)
Interest expense, net									(208)	(195)	(214)
Depreciation and amortization									(311)	(284)	(273)
Non-operating pension and other post-retirement employee benefit (cost) income									(368)	27	34
Exchange (losses) gains, net									(2)	1	3
Restructuring, asset-related, and other charges									(87)	(49)	(57)
Loss on extinguishment of debt									0	(38)	(1)
Gain on sales of assets and businesses									10	45	22
Transaction costs									(3)	(9)	(3)
Legal and environmental charges									(175)	(82)	(9)
Other charges										(1)	(12)
(Loss) income before income taxes	$ (454)	$ 91	$ 133	$ 107	$ 182	$ 269	$ 323	$ 381	$ (124)	$ 1,155	$ 912

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