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Segment Information Geographic Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	$ 2,788	$ 2,310	$ 2,828
Operating Income (Loss)	636	(20)	526
Other operating credits and charges, net and loss on impairments of assets	(20)	(93)	(9)
General corporate expense, loss on early debt extinguishment, other income (expense) and interest, net	(52)	(33)	(114)
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest	621	(23)	521
Provision for income taxes	(125)	13	(122)
Income from continuing operations	497	(10)	399
Net Income (Loss) Attributable to Noncontrolling Interest	(2)	(5)	0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	499	(5)	399
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	977	1,034	1,032
Intersegment sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	(1)	(5)	0
UNITED STATES
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	2,425	1,968	2,409
Operating Income (Loss)	608	95	475
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	533	570	542
CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	643	653	861
Operating Income (Loss)	50	(17)	138
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	367	390	408
South America
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	185	178	174
Operating Income (Loss)	35	25	31
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	77	74	82
Intersegment sales | Intersegment sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	$ (465)	$ (489)	$ (616)

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