Goodwill, Capitalized Software and Other Intangible Assets 1 (Details) - USD ($) $ in Millions	Sep. 30, 2015	Mar. 31, 2015
Capitalized software and other intangible assets
Gross amortizable assets	$ 8,412	$ 8,039
Less: Fully amortized assets	6,448	6,250
Remaining amortizable assets	1,964	1,789
Accumulated amortization on remaining amortizable assets	1,011	1,058
Net assets	953	731
Purchased Software Products
Capitalized software and other intangible assets
Gross amortizable assets	6,000	5,717
Less: Fully amortized assets	4,865	4,859
Remaining amortizable assets	1,135	858
Accumulated amortization on remaining amortizable assets	474	413
Net assets	661	445
Internally Developed Software Products
Capitalized software and other intangible assets
Gross amortizable assets	1,485	1,486
Less: Fully amortized assets	979	835
Remaining amortizable assets	506	651
Accumulated amortization on remaining amortizable assets	330	414
Net assets	176	237
Other Intangible Assets
Capitalized software and other intangible assets
Gross amortizable assets	927	836
Less: Fully amortized assets	604	556
Remaining amortizable assets	323	280
Accumulated amortization on remaining amortizable assets	207	231
Net assets	$ 116	$ 49