Supplemental Guarantor Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Supplemental guarantor information statements of operation
Net sales	$ 2,549	$ 2,403	$ 2,414	$ 2,401	$ 2,500	$ 2,321	$ 2,441	$ 2,550	$ 9,767	$ 9,812	$ 11,063
Cost of goods sold (exclusive of depreciation and amortization)	2,203	2,093	2,074	2,098	2,162	2,036	2,077	2,202	8,468	8,477	9,743
Selling, general and administrative expenses	117	115	109	120	93	101	102	102	461	398	383
Depreciation and amortization	87	91	79	77	74	76	69	73	334	292	329
Research and development expenses	11	12	12	10	10	11	13	12	45	46	44
Interest expense and amortization of debt issuance costs	77	76	75	76	75	76	73	74	304	298	305
(Gain) loss on assets held for sale	0	(6)	0	0	0	0	2	(5)	(6)	(3)	111
Loss on extinguishment of debt					7	0	0	0	0	7	0
Restructuring charges, net									75	47	64
Equity in net loss of non-consolidated affiliates	0	5	3	4	1	10	3	2	12	16	13
Equity in net (income) loss of consolidated subsidiaries									0	0	0
Other income, net	(14)	(12)	(5)	(10)	(13)	(10)	(2)	(27)	(41)	(52)	(58)
Total expenses									9,652	9,526	10,934
Income before income taxes									115	286	129
Income tax provision	(15)	(3)	26	3	14	11	37	21	11	83	39
Net income	54	13	23	14	59	3	50	91	104	203	90
Net income attributable to noncontrolling interests	0	0	0	0	0	0	1	0	0	1	27
Net income attributable to our common shareholder	54	13	23	14	59	3	49	91	104	202	63
Comprehensive income (loss)									279	126	(166)
Less: Comprehensive income (loss) attributable to noncontrolling interest									(2)	1	16
Comprehensive income (loss) attributable to our common shareholder									281	125	(182)
Parent [Member]
Supplemental guarantor information statements of operation
Net sales									693	781	1,129
Cost of goods sold (exclusive of depreciation and amortization)									677	740	1,102
Selling, general and administrative expenses									48	(19)	(7)
Depreciation and amortization									16	14	17
Research and development expenses									1	7	30
Interest expense and amortization of debt issuance costs									315	320	311
(Gain) loss on assets held for sale									0	(5)	1
Loss on extinguishment of debt										7
Restructuring charges, net									8	12	33
Equity in net loss of non-consolidated affiliates									0	0	0
Equity in net (income) loss of consolidated subsidiaries									(448)	(455)	(337)
Other income, net									(35)	(49)	(83)
Total expenses									582	572	1,067
Income before income taxes									111	209	62
Income tax provision									7	7	(1)
Net income									104	202	63
Net income attributable to noncontrolling interests									0	0	0
Net income attributable to our common shareholder									104	202	63
Comprehensive income (loss)									281	125	(182)
Less: Comprehensive income (loss) attributable to noncontrolling interest									0	0	0
Comprehensive income (loss) attributable to our common shareholder									281	125	(182)
Guarantors [Member]
Supplemental guarantor information statements of operation
Net sales									8,080	8,076	9,157
Cost of goods sold (exclusive of depreciation and amortization)									7,055	7,028	8,097
Selling, general and administrative expenses									338	341	321
Depreciation and amortization									246	220	252
Research and development expenses									43	39	14
Interest expense and amortization of debt issuance costs									28	16	57
(Gain) loss on assets held for sale									(6)	2	26
Loss on extinguishment of debt										0
Restructuring charges, net									59	33	29
Equity in net loss of non-consolidated affiliates									12	16	13
Equity in net (income) loss of consolidated subsidiaries									(99)	(89)	(65)
Other income, net									(57)	(49)	14
Total expenses									7,619	7,557	8,758
Income before income taxes									461	519	399
Income tax provision									16	57	15
Net income									445	462	384
Net income attributable to noncontrolling interests									0	0	0
Net income attributable to our common shareholder									445	462	384
Comprehensive income (loss)									590	364	199
Less: Comprehensive income (loss) attributable to noncontrolling interest									0	0	0
Comprehensive income (loss) attributable to our common shareholder									590	364	199
Non-Guarantors [Member]
Supplemental guarantor information statements of operation
Net sales									2,416	2,440	2,657
Cost of goods sold (exclusive of depreciation and amortization)									2,158	2,194	2,424
Selling, general and administrative expenses									75	76	69
Depreciation and amortization									72	58	60
Research and development expenses									1	0	0
Interest expense and amortization of debt issuance costs									1	(3)	1
(Gain) loss on assets held for sale									0	0	84
Loss on extinguishment of debt										0
Restructuring charges, net									8	2	2
Equity in net loss of non-consolidated affiliates									0	0	0
Equity in net (income) loss of consolidated subsidiaries									0	0	0
Other income, net									11	11	(53)
Total expenses									2,326	2,338	2,587
Income before income taxes									90	102	70
Income tax provision									(12)	19	25
Net income									102	83	45
Net income attributable to noncontrolling interests									0	1	27
Net income attributable to our common shareholder									102	82	18
Comprehensive income (loss)									152	85	9
Less: Comprehensive income (loss) attributable to noncontrolling interest									(2)	1	16
Comprehensive income (loss) attributable to our common shareholder									154	84	(7)
Eliminations [Member]
Supplemental guarantor information statements of operation
Net sales									(1,422)	(1,485)	(1,880)
Cost of goods sold (exclusive of depreciation and amortization)									(1,422)	(1,485)	(1,880)
Selling, general and administrative expenses									0	0	0
Depreciation and amortization									0	0	0
Research and development expenses									0	0	0
Interest expense and amortization of debt issuance costs									(40)	(35)	(64)
(Gain) loss on assets held for sale									0	0	0
Loss on extinguishment of debt										0
Restructuring charges, net									0	0	0
Equity in net loss of non-consolidated affiliates									0	0	0
Equity in net (income) loss of consolidated subsidiaries									547	544	402
Other income, net									40	35	64
Total expenses									(875)	(941)	(1,478)
Income before income taxes									(547)	(544)	(402)
Income tax provision									0	0	0
Net income									(547)	(544)	(402)
Net income attributable to noncontrolling interests									0	0	0
Net income attributable to our common shareholder									(547)	(544)	(402)
Comprehensive income (loss)									(744)	(448)	(192)
Less: Comprehensive income (loss) attributable to noncontrolling interest									0	0	0
Comprehensive income (loss) attributable to our common shareholder									$ (744)	$ (448)	$ (192)