Accounting for Share-Based Compensation 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Recognized share-based compensation
Share-based compensation expense before tax	$ 18	$ 20	$ 62	$ 61
Income tax benefit	(4)	(6)	(20)	(20)
Net share-based compensation expense	14	14	42	41
Costs of Licensing and Maintenance [Member]
Recognized share-based compensation
Share-based compensation expense before tax	1	0	2	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	6	9	24	25
General and Administrative [Member]
Recognized share-based compensation
Share-based compensation expense before tax	6	5	21	17
Product Development and Enhancements [Member]
Recognized share-based compensation
Share-based compensation expense before tax	$ 4	$ 5	$ 12	$ 14