Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income attributable to our common shareholder	$ 104	$ 202	$ 63
Other comprehensive income (loss):
Currency translation adjustment attributable to our common shareholder	122	(53)	(83)
Change in fair value of effective portion of hedges, net attributable to our common shareholder	(21)	5	(43)
Change in pension and other benefits, net attributable to our common shareholder	120	(44)	(191)
Other comprehensive income (loss) before income tax effect attributable to our common shareholder	221	(92)	(317)
Income tax provision (benefit) related to items of other comprehensive income (loss) attributable to our common shareholder	44	(15)	(72)
Other comprehensive income (loss) net of tax attributable to our common shareholder	177	(77)	(245)
Comprehensive income (loss) attributable to our common shareholder	281	125	(182)
Net income attributable to noncontrolling interests	0	1	27
Currency translation adjustment attributable to noncontrolling interest	(2)	0	(8)
Change in fair value of effective portion of hedges, net attributable to noncontrolling interest	0	0	(3)
Other comprehensive (loss) income attributable to noncontrolling interest	(2)	0	(11)
Comprehensive (loss) income attributable to noncontrolling interest	(2)	1	16
Comprehensive income (loss)	$ 279	$ 126	$ (166)