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Divestitures 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Jun. 30, 2011 Internet Security Business [Member]	Jun. 30, 2010 Information Governance Business [Member]
Divestitures (Textual) [Abstract]
Selling price of discontinued components			$ 14	$ 19
Gain (loss) on disposal of discontinued components, net of taxes	23	(5)	23	(5)
Tax expense on disposal of discontinued components			$ 18	$ 4

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.