Goodwill, Capitalized Software and Other Intangible Assets 1 (Details) - USD ($) $ in Millions	Jun. 30, 2015	Mar. 31, 2015
Capitalized software and other intangible assets
Gross amortizable assets	$ 8,081	$ 8,039
Less: Fully amortized assets	6,283	6,250
Remaining amortizable assets	1,798	1,789
Accumulated amortization on remaining amortizable assets	1,098	1,058
Net assets	700	731
Purchased Software Products
Capitalized software and other intangible assets
Gross amortizable assets	5,758	5,717
Less: Fully amortized assets	4,865	4,859
Remaining amortizable assets	893	858
Accumulated amortization on remaining amortizable assets	436	413
Net assets	457	445
Internally Developed Software Products
Capitalized software and other intangible assets
Gross amortizable assets	1,486	1,486
Less: Fully amortized assets	862	835
Remaining amortizable assets	624	651
Accumulated amortization on remaining amortizable assets	419	414
Net assets	205	237
Other Intangible Assets
Capitalized software and other intangible assets
Gross amortizable assets	837	836
Less: Fully amortized assets	556	556
Remaining amortizable assets	281	280
Accumulated amortization on remaining amortizable assets	243	231
Net assets	$ 38	$ 49