Divestitures 1 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended												3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 ERwin [Member]	Mar. 31, 2013 ERwin [Member]	Mar. 31, 2012 ERwin [Member]	Mar. 31, 2014 ERwin [Member] Subscription and Maintenance [Member]	Mar. 31, 2013 ERwin [Member] Subscription and Maintenance [Member]	Mar. 31, 2012 ERwin [Member] Subscription and Maintenance [Member]	Mar. 31, 2014 ERwin [Member] Software Fees and Other [Member]	Mar. 31, 2013 ERwin [Member] Software Fees and Other [Member]	Mar. 31, 2012 ERwin [Member] Software Fees and Other [Member]	Jun. 30, 2011 Internet Security [Member]	Mar. 31, 2012 Internet Security [Member]	Mar. 31, 2012 Internet Security [Member] Subscription and Maintenance [Member]
Income from discontinued components
Total revenue				$ 32	$ 33	$ 35	$ 24	$ 25	$ 27	$ 8	$ 8	$ 8		$ 15	$ 15
Income (loss) from operations of discontinued components, net of tax				15	16	15								(10)
Gain on disposal of discontinued component, net of income taxes													23	23
Income from discontinued operations, net of income taxes	15	16	28											13
Tax expense (benefit) on income (loss) from operations of discontinued components				$ 8	$ 9	$ 9								$ (6)