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Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2012	Sep. 24, 2011
Income Taxes [Line Items]
Gross unrecognized tax benefits	$ 1,700,000,000	$ 1,400,000,000
Unrecognized tax benefits that would affect the effective tax rate	705,000,000	563,000,000
Unrecognized tax benefits, gross interest and penalties accrued	$ 278,000,000	$ 261,000,000

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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