Stock Plans 1 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Recognized share-based compensation
Share-based compensation expense before tax	$ 78	$ 89	$ 80
Income tax benefit	(25)	(29)	(26)
Net share-based compensation expense	53	60	54
Costs of Licensing and Maintenance [Member]
Recognized share-based compensation
Share-based compensation expense before tax	3	3	3
Cost of Professional Services [Member]
Recognized share-based compensation
Share-based compensation expense before tax	4	4	3
Selling and Marketing [Member]
Recognized share-based compensation
Share-based compensation expense before tax	31	36	30
General and Administrative [Member]
Recognized share-based compensation
Share-based compensation expense before tax	23	27	24
Product Development and Enhancements [Member]
Recognized share-based compensation
Share-based compensation expense before tax	$ 17	$ 19	$ 20