Other Income, Net (Other Income, Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
Other Income, Net [Abstract]
Interest income	$ 19		$ 18		$ 16
Equity in earnings(loss), net	9	[1]	(6)	[1]	6	[1]
Reimbursement of post-acquisition interest expense	0		16		0
Gain on sale of investment	0	[1]	0	[1]	17	[1]
Impairment of an investment	(6)		0		0
Other, net	(1)		8		4
Total	$ 21		$ 36		$ 43

[1] Recorded within our Distribution Solutions segment.