Income Taxes 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Current:
Federal	$ 275	$ 110	$ 198
State	37	48	15
Foreign	120	88	112
Total	432	246	325
Deferred:
Federal	4	65	28
State	(22)	5	13
Foreign	2	70	27
Total Deferred	(16)	140	68
Total
Federal	279	175	226
State	15	53	28
Foreign	122	158	139
Total	$ 416	$ 386	$ 393