Accounting for Share-Based Compensation 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Recognized share-based compensation
Share-based compensation expense before tax	$ 23	$ 18	$ 64	$ 62
Income tax benefit	(7)	(4)	(20)	(20)
Net share-based compensation expense	16	14	44	42
Costs of Licensing and Maintenance [Member]
Recognized share-based compensation
Share-based compensation expense before tax	1	1	3	2
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	6	23	24
General and Administrative [Member]
Recognized share-based compensation
Share-based compensation expense before tax	8	6	20	21
Product Development and Enhancements [Member]
Recognized share-based compensation
Share-based compensation expense before tax	$ 5	$ 4	$ 15	$ 12