Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Segment, Discontinued Operations [Member]	Dec. 31, 2011 Segment, Discontinued Operations [Member]	Dec. 31, 2010 Segment, Discontinued Operations [Member]	Jun. 30, 2010 Information Governance Business [Member]	Jun. 30, 2011 Internet Security Business [Member]
REVENUE
Subscription and maintenance revenue	$ 1,006	$ 974	$ 3,035	$ 2,852	$ 21	$ 15	$ 67
Professional services	103	88	289	245			1
TOTAL REVENUE	1,263	1,144	3,626	3,301	21	15	68
Discontinued Operations (Textual) [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)	141	126	337	284	2	(6)	5
Income (loss) from discontinued components
(Loss) income from operations of discontinued components, net of tax expense (benefit)		4	(10)	8
Gain (loss) on disposal of discontinued components, net of taxes			23	(5)				(5)	23
Income (loss) from discontinued operations, net of taxes	$ 0	$ 4	$ 13	$ 3