Stock Plans 1 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Recognized share-based compensation
Share-based compensation expense before tax	$ 82	$ 78	$ 89
Income tax benefit	(26)	(25)	(29)
Net share-based compensation expense	56	53	60
Costs of Licensing and Maintenance [Member]
Recognized share-based compensation
Share-based compensation expense before tax	4	3	3
Cost of Professional Services [Member]
Recognized share-based compensation
Share-based compensation expense before tax	4	4	4
Selling and Marketing [Member]
Recognized share-based compensation
Share-based compensation expense before tax	29	31	36
General and Administrative [Member]
Recognized share-based compensation
Share-based compensation expense before tax	26	23	27
Product Development and Enhancements [Member]
Recognized share-based compensation
Share-based compensation expense before tax	$ 19	$ 17	$ 19