Divestitures 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income from discontinued operations
Income from discontinued operations, net of tax	$ 21	$ 9	$ 26	$ 14
Discontinued Components [Member]
Income from discontinued operations
Total revenue	15	35	46	68
Income from operations of discontinued components, net of tax expense	2	9	7	14
Gain on disposal of discontinued component, net of tax	19	0	19	0
Income from discontinued operations, net of tax	21	9	26	14
Tax expense on income from operations of discontinued components	2	5	6	9
Discontinued Components [Member] | Subscription and Maintenance [Member]
Income from discontinued operations
Total revenue	10	23	31	45
Discontinued Components [Member] | Software Fees and Other [Member]
Income from discontinued operations
Total revenue	$ 5	$ 12	$ 15	$ 23