Income Taxes - Reconciliation of the Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
Sep. 24, 2016	Sep. 26, 2015	Sep. 27, 2014
Income Tax Disclosure [Abstract]
Computed expected tax	$ 21,480	$ 25,380	$ 18,719
State taxes, net of federal effect	553	680	469
Indefinitely invested earnings of foreign subsidiaries	(5,582)	(6,470)	(4,744)
Domestic production activities deduction	(382)	(426)	(495)
Research and development credit, net	(371)	(171)	(88)
Other	(13)	128	112
Provision for income taxes	$ 15,685	$ 19,121	$ 13,973
Effective tax rate	25.60%	26.40%	26.10%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Subparagraph (a),(b)
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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