Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income attributable to our common shareholder	$ 38	$ 23	$ 73	$ 37
Net income attributable to noncontrolling interests	0	0	0	0
Net income	38	23	73	37
Other comprehensive income (loss):
Currency translation adjustment attributable to our common shareholder	(131)	94	(105)	92
Currency translation adjustment attributable to noncontrolling interests	(2)	(1)	(1)	(2)
Currency translation adjustment	(133)	93	(106)	90
Net change in fair value of effective portion of cash flow hedges attributable to our common shareholder	(7)	3	6	(43)
Net change in fair value of effective portion of cash flow hedges attributable to noncontrolling interests	0	0	0	0
Net change in fair value of effective portion of cash flow hedges	(7)	3	6	(43)
Net change in pension and other benefits attributable to our common shareholder	10	97	(3)	103
Net change in pension and other benefits attributable to noncontrolling interests	0	0	0	0
Net change in pension and other benefits	10	97	(3)	103
Other comprehensive income (loss) before income tax effect attributable to our common shareholder	(128)	194	(102)	152
Other comprehensive income (loss) before income tax effect attributable to noncontrolling interests	(2)	(1)	(1)	(2)
Other comprehensive income (loss) before income tax effect	(130)	193	(103)	150
Income tax provision related to items of other comprehensive income (loss) attributable to our common shareholder	6	32	1	32
Income tax provision related to items of other comprehensive income (loss) attributable to noncontrolling interests	0	0	0	0
Income tax provision related to items of other comprehensive income (loss)	6	32	1	32
Other comprehensive (loss) income, net of tax, attributable to our common shareholder	(134)	162	(103)	120
Other comprehensive (loss) income, net of tax, attributable to noncontrolling interests	(2)	(1)	(1)	(2)
Other comprehensive (loss) income, net of tax	(136)	161	(104)	118
Comprehensive income (loss) attributable to our common shareholder	(96)	185	(30)	157
Comprehensive (loss) income attributable to noncontrolling interest	(2)	(1)	(1)	(2)
Comprehensive (loss) income	$ (98)	$ 184	$ (31)	$ 155