Goodwill Capitalized Software and Other Intangible Assets 1 (Details) (USD $) In Millions	Jun. 30, 2011	Mar. 31, 2011
Capitalized software and other intangible assets
Total capitalized software and other intangible assets, Gross	$ 7,471	$ 7,417
Total capitalized software and other intangible assets, Accumulated Amortization	6,196	6,133
Capitalized software and other intangible assets, net	1,275	1,284
Intangible Assets Not Fully Amortized [Member] | Purchased software products [Member]
Capitalized software and other intangible assets
Total capitalized software and other intangible assets, Gross	770	768
Total capitalized software and other intangible assets, Accumulated Amortization	221	198
Capitalized software and other intangible assets, net	549	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	715	693
Total capitalized software and other intangible assets, Accumulated Amortization	207	205
Capitalized software and other intangible assets, net	508	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	394	652
Total capitalized software and other intangible assets, Accumulated Amortization	176	440
Capitalized software and other intangible assets, net	218	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	1,879	2,127
Total capitalized software and other intangible assets, Accumulated Amortization	604	843
Capitalized software and other intangible assets, net	$ 1,275	$ 1,284