Long-Lived Assets 3 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Depreciation and amortization expense
Depreciation	$ 104	$ 111	$ 114
Total depreciation and amortization expense	477	401	379
Purchased Software Products [Member]
Depreciation and amortization expense
Amortization of intangible assets	163	103	88
Internally Developed Software Products [Member]
Depreciation and amortization expense
Amortization of intangible assets	156	122	104
Other Intangible Assets [Member]
Depreciation and amortization expense
Amortization of intangible assets	$ 54	$ 65	$ 73