Consolidated Statements of Operations (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 2,789	$ 2,847	$ 2,831	$ 2,680	$ 2,549	$ 2,403	$ 2,414	$ 2,401	$ 11,147	$ 9,767	$ 9,812
Cost of goods sold (exclusive of depreciation and amortization)	2,483	2,498	2,483	2,329	2,203	2,093	2,074	2,098	9,793	8,468	8,477
Selling, general and administrative expenses	108	108	103	108	117	115	109	120	427	461	398
Depreciation and amortization	86	87	90	89	87	91	79	77	352	334	292
Research and development expenses	12	14	12	12	11	12	12	10	50	45	46
Interest expense and amortization of debt issuance costs	78	85	82	81	77	76	75	76	326	304	298
Gain on assets held for sale, net	1	(12)	0	(11)	0	(6)	0	0	(22)	(6)	(3)
Loss on extinguishment of debt									0	0	7
Restructuring and impairment, net	(1)	25	7	6	29	19	18	9	37	75	47
Equity in net loss of non-consolidated affiliates	1	2	0	2	0	5	3	4	5	12	16
Other expense (income), net	3	(9)	18	5	(14)	(12)	(5)	(10)	17	(41)	(52)
Total expenses									10,985	9,652	9,526
Income before income taxes									162	115	286
Income tax provision	(11)	3	(2)	24	(15)	(3)	26	3	14	11	83
Net income	29	46	38	35	54	13	23	14	148	104	203
Net income attributable to noncontrolling interests	0	0	0	0	0	0	0	0	0	0	1
Net income attributable to our common shareholder	$ 29	$ 46	$ 38	$ 35	$ 54	$ 13	$ 23	$ 14	$ 148	$ 104	$ 202