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Cash and Available-for-Sale Securities' Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value Recorded as Cash and Cash Equivalents or Short-Term or Long-Term Marketable Securities (Detail) - USD ($) $ in Millions	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 206,420	$ 155,332
Unrealized Gains	574	418
Unrealized Losses	(1,328)	(511)
Fair Value	205,666	155,239
Cash and cash equivalents	21,120	13,844	$ 14,259	$ 10,746
Short-term marketable securities	20,481	11,233
Long-term marketable securities	164,065	130,162
Cash
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	11,389	10,232
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	11,389	10,232
Cash and cash equivalents	11,389	10,232
Short-term marketable securities	0	0
Long-term marketable securities	0	0
Level 1
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	3,570	4,077
Unrealized Gains	0	1
Unrealized Losses	(144)	(132)
Fair Value	3,426	3,946
Cash and cash equivalents	1,798	1,546
Short-term marketable securities	1,628	2,400
Long-term marketable securities	0	0
Level 1 | Money market funds
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	1,798	1,546
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	1,798	1,546
Cash and cash equivalents	1,798	1,546
Short-term marketable securities	0	0
Long-term marketable securities	0	0
Level 1 | Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	1,772	2,531
Unrealized Gains	0	1
Unrealized Losses	(144)	(132)
Fair Value	1,628	2,400
Cash and cash equivalents	0	0
Short-term marketable securities	1,628	2,400
Long-term marketable securities	0	0
Level 2
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	191,461	141,023
Unrealized Gains	574	417
Unrealized Losses	(1,184)	(379)
Fair Value	190,851	141,061
Cash and cash equivalents	7,933	2,066
Short-term marketable securities	18,853	8,833
Long-term marketable securities	164,065	130,162
Level 2 | U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	34,902	23,140
Unrealized Gains	181	15
Unrealized Losses	(1)	(9)
Fair Value	35,082	23,146
Cash and cash equivalents	0	12
Short-term marketable securities	3,498	607
Long-term marketable securities	31,584	22,527
Level 2 | U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	5,864	7,373
Unrealized Gains	14	3
Unrealized Losses	0	(11)
Fair Value	5,878	7,365
Cash and cash equivalents	841	652
Short-term marketable securities	767	157
Long-term marketable securities	4,270	6,556
Level 2 | Non-U.S. government securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	6,356	6,925
Unrealized Gains	45	69
Unrealized Losses	(167)	(69)
Fair Value	6,234	6,925
Cash and cash equivalents	43	0
Short-term marketable securities	135	204
Long-term marketable securities	6,056	6,721
Level 2 | Certificates of deposit and time deposits
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	4,347	3,832
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	4,347	3,832
Cash and cash equivalents	2,065	1,230
Short-term marketable securities	1,405	1,233
Long-term marketable securities	877	1,369
Level 2 | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	6,016	475
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	6,016	475
Cash and cash equivalents	4,981	166
Short-term marketable securities	1,035	309
Long-term marketable securities	0	0
Level 2 | Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	116,908	85,431
Unrealized Gains	242	296
Unrealized Losses	(985)	(241)
Fair Value	116,165	85,486
Cash and cash equivalents	3	6
Short-term marketable securities	11,948	6,298
Long-term marketable securities	104,214	79,182
Level 2 | Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	947	940
Unrealized Gains	5	8
Unrealized Losses	0	0
Fair Value	952	948
Cash and cash equivalents	0	0
Short-term marketable securities	48	0
Long-term marketable securities	904	948
Level 2 | Mortgage- and asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	16,121	12,907
Unrealized Gains	87	26
Unrealized Losses	(31)	(49)
Fair Value	16,177	12,884
Cash and cash equivalents	0	0
Short-term marketable securities	17	25
Long-term marketable securities	$ 16,160	$ 12,859

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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