Accounting for Share-Based Compensation 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
Recognized share-based compensation
Share-based compensation expense before tax	$ 23	$ 23	$ 65	$ 63
Income tax benefit	(7)	(7)	(20)	(20)
Net share-based compensation expense	16	16	45	43
Costs of Licensing and Maintenance [Member]
Recognized share-based compensation
Share-based compensation expense before tax	2	1	4	3
Cost of Professional Services [Member]
Recognized share-based compensation
Share-based compensation expense before tax	1	1	3	3
Selling and Marketing [Member]
Recognized share-based compensation
Share-based compensation expense before tax	8	8	23	22
General and Administrative [Member]
Recognized share-based compensation
Share-based compensation expense before tax	8	8	21	20
Product Development and Enhancements [Member]
Recognized share-based compensation
Share-based compensation expense before tax	$ 4	$ 5	$ 14	$ 15