Goodwill, Capitalized Software and Other Intangible Assets 1 (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Capitalized software and other intangible assets
Gross Amortizable Assets	$ 7,842	$ 7,808
Less: Fully Amortized Assets	5,762	5,719
Remaining Amortizable Assets	2,080	2,089
Accumulated Amortization on Remaining Amortizable Assets	732	700
Net Assets	1,348	1,389
Purchased software products [Member]
Capitalized software and other intangible assets
Gross Amortizable Assets	5,628	5,628
Less: Fully Amortized Assets	4,737	4,733
Remaining Amortizable Assets	891	895
Accumulated Amortization on Remaining Amortizable Assets	250	228
Net Assets	641	667
Internally Developed Software Products [Member]
Capitalized software and other intangible assets
Gross Amortizable Assets	1,402	1,366
Less: Fully Amortized Assets	596	574
Remaining Amortizable Assets	806	792
Accumulated Amortization on Remaining Amortizable Assets	273	258
Net Assets	533	534
Other intangible assets [Member]
Capitalized software and other intangible assets
Gross Amortizable Assets	812	814
Less: Fully Amortized Assets	429	412
Remaining Amortizable Assets	383	402
Accumulated Amortization on Remaining Amortizable Assets	209	214
Net Assets	$ 174	$ 188