Accounting for Share-Based Compensation 1 (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Recognized share-based compensation
Share-based compensation expense before tax	$ 22	$ 20
Income tax benefit	(7)	(6)
Net share-based compensation expense	15	14
Costs of Licensing and Maintenance
Recognized share-based compensation
Share-based compensation expense before tax	2	1
Cost of Professional Services
Recognized share-based compensation
Share-based compensation expense before tax	1	1
Selling and Marketing
Recognized share-based compensation
Share-based compensation expense before tax	8	7
General and Administrative
Recognized share-based compensation
Share-based compensation expense before tax	7	6
Product Development and Enhancements
Recognized share-based compensation
Share-based compensation expense before tax	$ 4	$ 5