Long-Lived Assets 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Depreciation and amortization expense
Depreciation	$ 62	$ 71	$ 84
Total depreciation and amortization expense	362	402	415
Purchased Software Products
Depreciation and amortization expense
Amortization of intangible assets	146	124	116
Internally Developed Software Products
Depreciation and amortization expense
Amortization of intangible assets	110	149	155
Other Intangible Assets
Depreciation and amortization expense
Amortization of intangible assets	$ 44	$ 58	$ 60