Goodwill, Capitalized Software and Other Intangible Assets 1 (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Capitalized software and other intangible assets    
Gross amortizable assets $ 8,042 $ 8,113
Less: Fully amortized assets 6,191 6,095
Remaining amortizable assets 1,851 2,018
Accumulated amortization on remaining amortizable assets 1,036 955
Net assets 815 1,063
Purchased Software Products [Member]    
Capitalized software and other intangible assets    
Gross amortizable assets 5,719 5,706
Less: Fully amortized assets 4,857 4,849
Remaining amortizable assets 862 857
Accumulated amortization on remaining amortizable assets 379 309
Net assets 483 548
Internally Developed Software Products [Member]    
Capitalized software and other intangible assets    
Gross amortizable assets 1,486 1,561
Less: Fully amortized assets 814 757
Remaining amortizable assets 672 804
Accumulated amortization on remaining amortizable assets 403 397
Net assets 269 407
Other Intangible Assets [Member]    
Capitalized software and other intangible assets    
Gross amortizable assets 837 846
Less: Fully amortized assets 520 489
Remaining amortizable assets 317 357
Accumulated amortization on remaining amortizable assets 254 249
Net assets $ 63 $ 108