Segment, Major Customer and Major Supplier Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014
Segment Reporting Information [Line Items]
Investment in and advances to non–consolidated affiliates	$ 560		$ 560		$ 612
Assets held for sale - Investment in and advances to non-consolidated affiliates	40		40		39
Total assets	9,321		9,321		9,114
Net sales	2,831	2,414	5,511	4,815
Depreciation and amortization	90	79	179	156
Income tax (benefit) provision	(2)	26	22	29
Capital expenditures			264	365
North America [Member]
Segment Reporting Information [Line Items]
Investment in and advances to non–consolidated affiliates	0		0		0
Assets held for sale - Investment in and advances to non-consolidated affiliates	0		0		0
Total assets	2,857		2,857		2,998
Net sales	907	757	1,728	1,537
Europe [Member]
Segment Reporting Information [Line Items]
Investment in and advances to non–consolidated affiliates	560		560		612
Assets held for sale - Investment in and advances to non-consolidated affiliates	0		0		0
Total assets	3,108		3,108		3,046
Net sales	963	809	1,877	1,616
Asia [Member]
Segment Reporting Information [Line Items]
Investment in and advances to non–consolidated affiliates	0		0		0
Assets held for sale - Investment in and advances to non-consolidated affiliates	0		0		0
Total assets	1,550		1,550		1,440
Net sales	568	463	1,124	948
South America [Member]
Segment Reporting Information [Line Items]
Investment in and advances to non–consolidated affiliates	0		0		0
Assets held for sale - Investment in and advances to non-consolidated affiliates	40		40		39
Total assets	1,739		1,739		1,583
Net sales	445	391	865	725
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Investment in and advances to non–consolidated affiliates	0		0		0
Assets held for sale - Investment in and advances to non-consolidated affiliates	0		0		0
Total assets	67		67		47
Net sales	(52)	(6)	(83)	(11)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	2,831	2,414	5,511	4,815
Depreciation and amortization	90	79	179	156
Income tax (benefit) provision	(2)	26	22	29
Capital expenditures	126	184	264	365
Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Net sales	901	756	1,716	1,532
Depreciation and amortization	34	30	68	60
Income tax (benefit) provision	4	(6)	(5)	(7)
Capital expenditures	28	30	47	57
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Net sales	931	770	1,811	1,548
Depreciation and amortization	27	25	52	49
Income tax (benefit) provision	7	13	19	24
Capital expenditures	61	52	150	96
Operating Segments [Member] | Asia [Member]
Segment Reporting Information [Line Items]
Net sales	531	461	1,060	933
Depreciation and amortization	18	14	38	28
Income tax (benefit) provision	3	7	6	11
Capital expenditures	14	59	34	124
Operating Segments [Member] | South America [Member]
Segment Reporting Information [Line Items]
Net sales	422	380	825	707
Depreciation and amortization	16	16	33	31
Income tax (benefit) provision	(19)	10	(7)	(5)
Capital expenditures	11	37	28	77
Operating Segments [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	46	47	99	95
Depreciation and amortization	(5)	(6)	(12)	(12)
Income tax (benefit) provision	3	2	9	6
Capital expenditures	12	6	5	11
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Intersegment Elimination [Member] | North America [Member]
Segment Reporting Information [Line Items]
Net sales	6	1	12	5
Intersegment Elimination [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Net sales	32	39	66	68
Intersegment Elimination [Member] | Asia [Member]
Segment Reporting Information [Line Items]
Net sales	37	2	64	15
Intersegment Elimination [Member] | South America [Member]
Segment Reporting Information [Line Items]
Net sales	23	11	40	18
Intersegment Elimination [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	$ (98)	$ (53)	$ (182)	$ (106)