Goodwill Capitalized Software and Other Intangible Assets 1 (Details) (USD $) In Millions	Sep. 30, 2011	Mar. 31, 2011
Capitalized software and other intangible assets
Total capitalized software and other intangible assets, Gross	$ 7,670	$ 7,417
Total capitalized software and other intangible assets, Accumulated Amortization	6,263	6,133
Capitalized software and other intangible assets, net	1,407	1,284
Purchased software products [Member] | Intangible Assets Not Fully Amortized [Member]
Capitalized software and other intangible assets
Total capitalized software and other intangible assets, Gross	892	768
Total capitalized software and other intangible assets, Accumulated Amortization	213	198
Capitalized software and other intangible assets, net	679	570
Intangible Assets Not Fully Amortized [Member] | Internally developed software products [Member]
Capitalized software and other intangible assets
Total capitalized software and other intangible assets, Gross	744	693
Total capitalized software and other intangible assets, Accumulated Amortization	224	205
Capitalized software and other intangible assets, net	520	488
Intangible Assets Not Fully Amortized [Member] | Other intangible assets subject to amortization [Member]
Capitalized software and other intangible assets
Total capitalized software and other intangible assets, Gross	399	652
Total capitalized software and other intangible assets, Accumulated Amortization	191	440
Capitalized software and other intangible assets, net	208	212
Intangible Assets Not Fully Amortized [Member] | Other intangible assets not subject to amortization [Member]
Capitalized software and other intangible assets
Total capitalized software and other intangible assets, Gross		14
Capitalized software and other intangible assets, net		14
Intangible Assets Not Fully Amortized [Member] | Capitalized software and other intangible assets [Member]
Capitalized software and other intangible assets
Total capitalized software and other intangible assets, Gross	2,035	2,127
Total capitalized software and other intangible assets, Accumulated Amortization	628	843
Capitalized software and other intangible assets, net	$ 1,407	$ 1,284