Aggregate Changes in Gross Unrecognized Tax Benefits Excluding Interest and Penalties (Detail) - USD ($) $ in Millions	12 Months Ended
Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Income Taxes [Line Items]
Beginning Balance	$ 4,033	$ 2,714	$ 2,062
Increases related to tax positions taken during a prior year	2,056	1,295	745
Decreases related to tax positions taken during a prior year	(345)	(280)	(118)
Increases related to tax positions taken during the current year	1,278	882	626
Decreases related to settlements with taxing authorities	(109)	(574)	(592)
Decreases related to expiration of statute of limitations	(13)	(4)	(9)
Ending Balance	$ 6,900	$ 4,033	$ 2,714

Income Taxes [Line Items]

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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