Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 4,278	$ 2,371	$ 2,533	$ 2,581	$ 2,389	$ 2,273	$ 2,314	$ 2,298	$ 11,763	$ 9,274	$ 8,597
Cost of Sales	3,698	2,014	2,157	2,202	2,019	1,912	1,949	1,932	10,071	7,812	7,126
Earnings before interest expense, income taxes, and noncontrolling interests	(31)	109	109	119	132	131	23	122	306	408	479
Net Income	$ (109)	$ 57	$ 47	$ 60	$ 62	$ 80	$ (5)	$ 61	$ 55	$ 198	$ 347
Basic earnings (loss) per share of common stock (in dollars per share)	$ (1.35)	$ 1.11	$ 0.92	$ 1.17	$ 1.19	$ 1.53	$ (0.09)	$ 1.13	$ 0.93	$ 3.75	$ 6.20
Diluted earnings (loss) per share of common stock (in dollars per share)	$ (1.35)	$ 1.11	$ 0.92	$ 1.17	$ 1.19	$ 1.53	$ (0.09)	$ 1.12	$ 0.93	$ 3.73	$ 6.15
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales		$ 2,372	$ 2,537	$ 2,574	$ 2,391	$ 2,274	$ 2,317	$ 2,292		$ 9,274	$ 8,599
Cost of Sales		2,014	2,159	2,198	2,020	1,911	1,949	1,929		7,809	7,116
Earnings before interest expense, income taxes, and noncontrolling interests		104	113	117	135	134	27	121		417	516
Net Income		$ 54	$ 50	$ 58	$ 68	$ 83	$ (3)	$ 59		$ 207	$ 356
Basic earnings (loss) per share of common stock (in dollars per share)		$ 1.05	$ 0.98	$ 1.13	$ 1.33	$ 1.57	$ (0.05)	$ 1.10		$ 3.93	$ 6.36
Diluted earnings (loss) per share of common stock (in dollars per share)		$ 1.05	$ 0.98	$ 1.13	$ 1.33	$ 1.57	$ (0.05)	$ 1.09		$ 3.91	$ 6.31
Revisions
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales		$ (1)	$ (4)	$ 7	$ (2)	$ (1)	$ (3)	$ 6		$ 0	$ (2)
Cost of Sales		0	(2)	4	(1)	1	0	3		3	10
Earnings before interest expense, income taxes, and noncontrolling interests		5	(4)	2	(3)	(3)	(3)	1		(8)	(13)
Net Income		$ 3	$ (3)	$ 2	$ (6)	$ (3)	$ (2)	$ 2		$ (9)	$ (9)
Basic earnings (loss) per share of common stock (in dollars per share)		$ 0.06	$ (0.06)	$ 0.04	$ (0.14)	$ (0.04)	$ (0.04)	$ 0.03		$ (0.18)	$ (0.16)
Diluted earnings (loss) per share of common stock (in dollars per share)		$ 0.06	$ (0.06)	$ 0.04	$ (0.14)	$ (0.04)	$ (0.04)	$ 0.03		$ (0.18)	$ (0.16)
Reclasses
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Earnings before interest expense, income taxes, and noncontrolling interests										$ (1)	$ (24)
Reclasses | As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Earnings before interest expense, income taxes, and noncontrolling interests		$ 0	$ 0	$ 0	$ 0	$ 0	$ (1)	$ 0		(1)
As Reclassified
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Sales										9,274	8,599
Cost of Sales										7,809	7,116
Earnings before interest expense, income taxes, and noncontrolling interests										416	492
Net Income										$ 207	$ 356
Basic earnings (loss) per share of common stock (in dollars per share)										$ 3.93	$ 6.36
Diluted earnings (loss) per share of common stock (in dollars per share)										$ 3.91	$ 6.31
As Reclassified | As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Earnings before interest expense, income taxes, and noncontrolling interests		$ 104	$ 113	$ 117	$ 135	$ 134	$ 26	$ 121		$ 416