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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, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011	Sep. 25, 2010
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 147,143	$ 120,220
Unrealized Gains	414	1,051
Unrealized Losses	(796)	(20)
Fair Value	146,761	121,251
Cash and Cash Equivalents	14,259	10,746	9,815	11,261
Short-term marketable securities	26,287	18,383
Long-term marketable securities	106,215	92,122
Cash
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	8,705	3,109
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	8,705	3,109
Cash and Cash Equivalents	8,705	3,109
Short-term marketable securities	0	0
Long-term marketable securities	0	0
Level 1
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	5,792	3,845
Unrealized Gains	0	79
Unrealized Losses	(197)	(2)
Fair Value	5,595	3,922
Cash and Cash Equivalents	1,793	1,460
Short-term marketable securities	3,802	2,462
Long-term marketable securities	0	0
Level 1 \| Money market funds
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	1,793	1,460
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	1,793	1,460
Cash and Cash Equivalents	1,793	1,460
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	3,999	2,385
Unrealized Gains	0	79
Unrealized Losses	(197)	(2)
Fair Value	3,802	2,462
Cash and Cash Equivalents	0	0
Short-term marketable securities	3,802	2,462
Long-term marketable securities	0	0
Level 2
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	132,646	113,266
Unrealized Gains	414	972
Unrealized Losses	(599)	(18)
Fair Value	132,461	114,220
Cash and Cash Equivalents	3,761	6,177
Short-term marketable securities	22,485	15,921
Long-term marketable securities	106,215	92,122
Level 2 \| U.S. Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	27,642	20,088
Unrealized Gains	24	21
Unrealized Losses	(47)	(1)
Fair Value	27,619	20,108
Cash and Cash Equivalents	431	2,608
Short-term marketable securities	7,554	3,525
Long-term marketable securities	19,634	13,975
Level 2 \| U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	16,878	19,540
Unrealized Gains	12	58
Unrealized Losses	(52)	(1)
Fair Value	16,838	19,597
Cash and Cash Equivalents	177	1,460
Short-term marketable securities	3,412	1,884
Long-term marketable securities	13,249	16,253
Level 2 \| Non-U.S. government securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	5,545	5,483
Unrealized Gains	35	183
Unrealized Losses	(137)	(2)
Fair Value	5,443	5,664
Cash and Cash Equivalents	50	84
Short-term marketable securities	313	1,034
Long-term marketable securities	5,080	4,546
Level 2 \| Certificates of deposit and time deposits
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	2,344	2,189
Unrealized Gains	0	2
Unrealized Losses	0	0
Fair Value	2,344	2,191
Cash and Cash Equivalents	1,264	1,106
Short-term marketable securities	844	202
Long-term marketable securities	236	883
Level 2 \| Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	2,998	2,112
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	2,998	2,112
Cash and Cash Equivalents	1,835	909
Short-term marketable securities	1,163	1,203
Long-term marketable securities	0	0
Level 2 \| Corporate Securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	54,586	46,261
Unrealized Gains	275	568
Unrealized Losses	(252)	(8)
Fair Value	54,609	46,821
Cash and Cash Equivalents	0	10
Short-term marketable securities	8,077	7,455
Long-term marketable securities	46,532	39,356
Level 2 \| Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	6,257	5,645
Unrealized Gains	45	74
Unrealized Losses	(22)	0
Fair Value	6,280	5,719
Cash and Cash Equivalents	4	0
Short-term marketable securities	1,114	618
Long-term marketable securities	5,162	5,101
Level 2 \| Mortgage and asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	16,396	11,948
Unrealized Gains	23	66
Unrealized Losses	(89)	(6)
Fair Value	16,330	12,008
Cash and Cash Equivalents	0	0
Short-term marketable securities	8	0
Long-term marketable securities	$ 16,322	$ 12,008

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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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