Accounting for Share-Based Compensation 1 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Recognized share-based compensation
Share-based compensation expense before tax	$ 25	$ 23	$ 70	$ 65
Income tax benefit	(8)	(7)	(22)	(20)
Net share-based compensation expense	17	16	48	45
Costs of Licensing and Maintenance
Recognized share-based compensation
Share-based compensation expense before tax	2	2	5	4
Cost of Professional Services
Recognized share-based compensation
Share-based compensation expense before tax	1	1	3	3
Selling and Marketing
Recognized share-based compensation
Share-based compensation expense before tax	9	8	25	23
General and Administrative
Recognized share-based compensation
Share-based compensation expense before tax	9	8	25	21
Product Development and Enhancements
Recognized share-based compensation
Share-based compensation expense before tax	$ 4	$ 4	$ 12	$ 14