Divestitures 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Income from discontinued operations
Income from discontinued operations, net of tax	$ 4	$ 7	$ 30	$ 21
Discontinued Components [Member]
Income from discontinued operations
Total revenue	9	35	55	103
Income from operations of discontinued components, net of tax expense	4	7	11	21
Gain on disposal of discontinued component, net of tax			19	0
Income from discontinued operations, net of tax			30	21
Tax expense on income from operations of discontinued components	2	6	8	15
Discontinued Components [Member] | Subscription and Maintenance [Member]
Income from discontinued operations
Total revenue	7	22	38	67
Discontinued Components [Member] | Software Fees and Other [Member]
Income from discontinued operations
Total revenue	$ 2	$ 13	$ 17	$ 36