Other Income (Expense), Net (Summary of Other Income (Expense), Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2013
Other Nonoperating Income (Expense) [Abstract]
Interest income	$ 20		$ 16		$ 22
Equity in earnings (loss), net (1)	12	[1]	0	[1]	3	[1]
Other, net (1)	31	[1]	16	[1]	9	[1]
Total	$ 63		$ 32		$ 34

[1] Primarily recorded within our Distribution Solutions segment.