Accounting for Share-Based Compensation 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Recognized share-based compensation
Share-based compensation expense before tax	$ 20	$ 23
Income tax benefit	(7)	(8)
Net share-based compensation expense	13	15
Costs of Licensing and Maintenance [Member]
Recognized share-based compensation
Share-based compensation expense before tax	1	0
Cost of Professional Services [Member]
Recognized share-based compensation
Share-based compensation expense before tax	1	1
Selling and Marketing [Member]
Recognized share-based compensation
Share-based compensation expense before tax	7	10
General and Administrative [Member]
Recognized share-based compensation
Share-based compensation expense before tax	6	8
Product Development and Enhancements [Member]
Recognized share-based compensation
Share-based compensation expense before tax	$ 5	$ 4