Long-Lived Assets 2 (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Capitalized software and other intangible assets
Gross amortizable assets	$ 7,941	$ 7,808
Less: Fully amortized assets	5,825	5,719
Remaining amortizable assets	2,116	2,089
Accumulated amortization on remaining amortizable assets	885	700
Net assets	1,231	1,389
Purchased Software Products [Member]
Capitalized software and other intangible assets
Gross amortizable assets	5,597	5,628
Less: Fully amortized assets	4,735	4,733
Remaining amortizable assets	862	895
Accumulated amortization on remaining amortizable assets	309	228
Net assets	553	667
Internally Developed Software Products [Member]
Capitalized software and other intangible assets
Gross amortizable assets	1,528	1,366
Less: Fully amortized assets	661	574
Remaining amortizable assets	867	792
Accumulated amortization on remaining amortizable assets	327	258
Net assets	540	534
Other Intangible Assets [Member]
Capitalized software and other intangible assets
Gross amortizable assets	816	814
Less: Fully amortized assets	429	412
Remaining amortizable assets	387	402
Accumulated amortization on remaining amortizable assets	249	214
Net assets	$ 138	$ 188