Divestitures 1 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income from discontinued operations
Income from discontinued operations, net of tax	$ 4	$ 4	$ 11	$ 30
Discontinued Operations
Income from discontinued operations
Total revenue	7	9	22	55
Income from operations of discontinued components, net of tax expense	4	4	11	10
Gain on disposal of discontinued component, net of tax			0	20
Income from discontinued operations, net of tax			11	30
Tax expense on income from operations of discontinued components	2	2	6	8
Discontinued Operations | Subscription and Maintenance
Income from discontinued operations
Total revenue	5	7	16	38
Discontinued Operations | Software Fees and Other
Income from discontinued operations
Total revenue	$ 2	$ 2	$ 6	$ 17