Segment, Major Customer and Major Supplier Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of income from reportable segments to net income attributable to common shareholder
Depreciation and amortization	$ (90)	$ (79)	$ (179)	$ (156)
Interest expense and amortization of debt issuance costs	(82)	(75)	(163)	(151)
Adjustment to eliminate proportional consolidation	(9)	(8)	(17)	(19)
Unrealized (losses) gains on change in fair value of derivative instruments, net	(1)	4	0	(8)
Realized gains (losses) on derivative instruments not included in segment income	0	2	(1)	4
Gain on assets held for sale	0	0	11	0
Restructuring and impairment, net	(7)	(18)	(13)	(27)
Loss on sale of fixed assets	(2)	(1)	(3)	(2)
Other costs, net	(3)	(4)	(5)	(7)
Income before income taxes	36	49	95	66
Income tax provision	(2)	26	22	29
Net income	38	23	73	37
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to our common shareholder	38	23	73	37
Operating Segments [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Depreciation and amortization	(90)	(79)	(179)	(156)
Income tax provision	(2)	26	22	29
Operating Segments [Member] | North America [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit	76	70	140	116
Depreciation and amortization	(34)	(30)	(68)	(60)
Income tax provision	4	(6)	(5)	(7)
Operating Segments [Member] | Europe [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit	75	61	154	131
Depreciation and amortization	(27)	(25)	(52)	(49)
Income tax provision	7	13	19	24
Operating Segments [Member] | Asia [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit	36	41	73	87
Depreciation and amortization	(18)	(14)	(38)	(28)
Income tax provision	3	7	6	11
Operating Segments [Member] | South America [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit	41	56	96	98
Depreciation and amortization	(16)	(16)	(33)	(31)
Income tax provision	(19)	10	(7)	(5)
Intersegment Eliminations [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit	$ 2	$ 0	$ 2	$ 0