Commitments and Contingencies 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Rent expense, net	$ 144	$ 148	$ 152
Future purchase commitments	169
Future purchase commitments due within five years	157
Loss contingency, Range of reasonably possible loss, Minimum	0
Loss contingency, Range of reasonably possible loss, Maximum	$ 30