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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Dec. 30, 2011	Jul. 01, 2011	Dec. 31, 2010	Dec. 30, 2011	Dec. 31, 2010	Dec. 02, 2009
Income Taxes [Abstract]
Effective tax rates	12.00%		20.00%	21.00%	14.00%
Additional tax benefit from Veritas v. Commissioner Tax Court decision		$ 39			$ 39
Tax benefit (expense) from current quarter discrete events primarily related to tax settlements and lapses of statutes of limitations	(2)		11	14	26
Tax benefits related to tax settlements and adjustments	4			4
Forecast tax rate				29.00%	28.00%
Original IRS Assessment						80
Income tax expense (benefit)				52
Reduction in unrecognized tax benefits				$ 30

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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