Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 3,204	$ 3,017	$ 2,913
Cost of products sold	2,539	2,312	2,263
Gross profit	665	705	650
Selling and administrative expenses	298	304	302
Long-lived asset impairment charges	0	10	0
Recovery of receivable	0	(3)	(6)
Gain on disposal of shipping operations, net	0	0	(1)
Operating profit	367	394	355
Income from equity method investments	59	49	48
Interest expense	(69)	(145)	(163)
Interest income	4	4	2
Income and gain from the sale of equity method investment to related party	0	0	13
Loss on extinguishment of debt	(22)	(37)	(19)
Other (expense) income, net	(4)	9	0
Income from continuing operations before income taxes	335	274	236
Income tax (expense) benefit	(238)	(63)	740
Income from continuing operations	97	211	976
(Loss) income from discontinued operations, net of tax	(9)	20	15
Gain on sale of discontinued operations, net of tax	0	279	0
Net income	$ 88	$ 510	$ 991
Earnings per common share - basic:
Income from continuing operations (in dollars per share)	$ 0.67	$ 1.45	$ 6.70
(Loss) income from and gain on sale of discontinued operations (in dollars per share)	(0.06)	2.04	0.11
Net income (in dollars per share)	0.61	3.49	6.81
Earnings per common share - diluted:
Income from continuing operations (in dollars per share)	0.66	1.44	6.62
(Loss) income from and gain on sale of discontinued operations (in dollars per share)	(0.06)	2.02	0.11
Net income (in dollars per share)	$ 0.60	$ 3.46	$ 6.73
Average common shares (in shares)	144,447,488	145,929,506	145,457,208
Dilutive awards under long-term incentive plan (in shares)	2,263,358	1,731,473	1,624,866
Deferred shares for non-employee directors (in shares)	0	0	164,526
Average diluted common shares (in shares)	146,710,846	147,660,979	147,246,600