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Divestitures 2 (Details) (Internet Security Business [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2011
Internet Security Business [Member]
Divestitures (Textual) [Abstract]
Selling price of discontinued components	$ 14
Gain on disposal of discontinued components, net of taxes	23
Tax expense related to gain on disposal of discontinued components	18
Tax benefit on loss from operations of discontinued components	$ 6

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

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

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