Discontinued Operations 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Jun. 30, 2010 Information Governance Business [Member]	Jun. 30, 2011 Internet Security Business [Member]
Discontinued Operations (Textual) [Abstract]
Selling price				$ 19	$ 14
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	23	(5)	0	(5)	23
Tax expenses related to gain (loss) on disposal				4	18
Tax effect of income loss from discontinued operations	$ (6)	$ 4	$ 7

Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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- Definition

Tax expense or benefit on the gain (loss), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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