Divestitures 1 (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income from discontinued operations
Income from discontinued operations, net of tax	$ 14	$ 36	$ 27
Discontinued Operations
Income from discontinued operations
Total revenue	27	62	135
Income from operations of discontinued components, net of tax expense of $7 million, $10 million and $19 million, respectively	12	16	27
Gain on disposal of discontinued components, net of tax	2	20	0
Income from discontinued operations, net of tax	14	36	27
Tax expense on income from operations of discontinued components	7	10	19
Discontinued Operations | Subscription and Maintenance
Income from discontinued operations
Total revenue	20	43	88
Discontinued Operations | Software Fees and Other
Income from discontinued operations
Total revenue	$ 7	$ 19	$ 47