Goodwill, Capitalized Software and Other Intangible Assets 1 (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Capitalized software and other intangible assets
Gross amortizable assets	$ 8,113	$ 8,113
Less: Fully amortized assets	6,110	6,095
Remaining amortizable assets	2,003	2,018
Accumulated amortization on remaining amortizable assets	1,025	955
Net assets	978	1,063
Purchased Software Products [Member]
Capitalized software and other intangible assets
Gross amortizable assets	5,706	5,706
Less: Fully amortized assets	4,849	4,849
Remaining amortizable assets	857	857
Accumulated amortization on remaining amortizable assets	337	309
Net assets	520	548
Internally Developed Software Products [Member]
Capitalized software and other intangible assets
Gross amortizable assets	1,561	1,561
Less: Fully amortized assets	771	757
Remaining amortizable assets	790	804
Accumulated amortization on remaining amortizable assets	425	397
Net assets	365	407
Other Intangible Assets [Member]
Capitalized software and other intangible assets
Gross amortizable assets	846	846
Less: Fully amortized assets	490	489
Remaining amortizable assets	356	357
Accumulated amortization on remaining amortizable assets	263	249
Net assets	$ 93	$ 108