Other Income (Expense), Net (Summary of Other Income (Expense), Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Other Nonoperating Income (Expense) [Abstract]
Interest income	$ 22		$ 19		$ 18
Equity in earnings (loss), net (1)	3	[1]	9	[1]	(6)	[1]
Reimbursement of post-acquisition interest expense	0		0		16
Impairment of an investment	0		(6)		0
Other, net	10		(1)		8
Total	$ 35		$ 21		$ 36

[1] Primarily recorded within our Distribution Solutions segment.