Severance and Exit Costs 1 (Details) (USD $) In Millions, unless otherwise specified					12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2014 Severance Charges [Member]	Mar. 31, 2013 Severance Charges [Member]	Mar. 31, 2012 Severance Charges [Member]	Mar. 31, 2014 Facility Exit Charges [Member]	Mar. 31, 2013 Facility Exit Charges [Member]	Mar. 31, 2012 Facility Exit Charges [Member]
Severance and exit costs activity
Accrued beginning balance	$ 84	$ 39	$ 53	$ 55	$ 16	$ 13	$ 8	$ 23	$ 40	$ 47
Expense					160	18	49	22	0	0
Change in estimate					(12)	(6)	(8)	0	0	0
Payments					(113)	(9)	(36)	(13)	(13)	(11)
Accretion and other					4	0	0	(3)	(4)	4
Accrued ending balance	$ 84	$ 39	$ 53	$ 55	$ 55	$ 16	$ 13	$ 29	$ 23	$ 40