Divestitures (Details) (USD $) In Millions	3 Months Ended				1 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Segment, Discontinued Operations [Member]	Jun. 30, 2010 Segment, Discontinued Operations [Member]	Jun. 30, 2010 Information Governance Business [Member]	Jun. 30, 2011 Internet Security Business [Member]
REVENUE:
Subscription and maintenance revenue	$ 1,007	$ 939	$ 15	$ 24
Professional services	90	78	0	1
Total revenue	1,163	1,069	15	25
Discontinued Operations (Textuals) [Abstract]
Selling price					19	14
Gain (loss) upon disposal	23	(5)			(5)	23
Tax expenses related to loss on disposal					4	18
Income tax expense (benefit)	105	87	(6)
Income tax expense (benefit), discontinued operations				less than a million
Income (loss) from discontinued components
(Loss) income from operations of discontinued components, net of tax expense benefit of ($6) million and tax expense of less than a million, respectively	(10)	1
Gain (loss) on disposal of discontinued components, net of taxes	23	(5)			(5)	23
Income (loss) from discontinued operations, net of taxes	$ 13	$ (4)