Segment, Geographical Area, Major Customer and Major Supplier Information (Income Reconciliation) (Details) (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
Reconciliation of income from reportable segments to net income attributable to common shareholder
Depreciation and amortization	$ (86)	$ (87)	$ (90)	$ (89)	$ (87)	$ (91)	$ (79)	$ (77)	$ (352)	$ (334)	$ (292)
Interest expense and amortization of debt issuance costs	(78)	(85)	(82)	(81)	(77)	(76)	(75)	(76)	(326)	(304)	(298)
Adjustment to eliminate proportional consolidation									(33)	(40)	(41)
Unrealized (losses) gains on change in fair value of derivative instruments, net									0	(10)	14
Realized (losses) gains on derivative instruments not included in segment income									(6)	5	5
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)
Loss on sale of fixed assets									(5)	(9)	(6)
Other costs, net									(3)	(9)	(6)
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
North America [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gain on assets held for sale, net									7
Operating Segments [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Depreciation and amortization										(334)	(292)
Income tax provision										11	83
Operating Segments [Member] | North America [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit									273	229	324
Operating Segments [Member] | Europe [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit									250	265	261
Operating Segments [Member] | Asia [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit									141	160	174
Operating Segments [Member] | South America [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit									240	231	202
Intersegment Eliminations [Member]
Reconciliation of income from reportable segments to net income attributable to common shareholder
Gross profit									$ (2)	$ 0	$ 0