Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Jul. 01, 2023	Sep. 24, 2022
Marketable Securities [Line Items]
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost	$ 177,778	$ 183,061
Cash Equivalents and Marketable Securities, Unrealized Gains	60	11
Cash Equivalents and Marketable Securities, Unrealized Losses	(11,295)	(13,963)
Cash, Cash Equivalents and Marketable Securities, Fair Value	166,543	169,109
Cash and Cash Equivalents	28,408	23,646
Current Marketable Securities	34,074	24,658
Non-Current Marketable Securities	104,061	120,805
Total marketable securities that were restricted from general use	14,100	12,700
Level 1
Marketable Securities [Line Items]
Marketable Securities, Equity, Adjusted Cost	1,474	3,203
Marketable Securities, Equity, Unrealized Gains	15	0
Marketable Securities, Equity, Unrealized Losses	(19)	(47)
Marketable Securities, Equity, Fair Value	1,470	3,156
Cash and Cash Equivalents	1,108	2,929
Current Marketable Securities	362	227
Non-Current Marketable Securities	0	0
Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	150,967	161,312
Marketable Securities, Debt, Unrealized Gains	45	11
Marketable Securities, Debt, Unrealized Losses	(11,276)	(13,916)
Marketable Securities, Debt, Fair Value	139,736	147,407
Cash and Cash Equivalents	1,963	2,171
Current Marketable Securities	33,712	24,431
Non-Current Marketable Securities	104,061	120,805
Cash
Marketable Securities [Line Items]
Cash	25,337	18,546
Cash and Cash Equivalents	25,337	18,546
Current Marketable Securities	0	0
Non-Current Marketable Securities	0	0
Money market funds | Level 1
Marketable Securities [Line Items]
Marketable Securities, Equity, Adjusted Cost	1,108	2,929
Marketable Securities, Equity, Unrealized Gains	0	0
Marketable Securities, Equity, Unrealized Losses	0	0
Marketable Securities, Equity, Fair Value	1,108	2,929
Cash and Cash Equivalents	1,108	2,929
Current Marketable Securities	0	0
Non-Current Marketable Securities	0	0
Mutual funds | Level 1
Marketable Securities [Line Items]
Marketable Securities, Equity, Adjusted Cost	366	274
Marketable Securities, Equity, Unrealized Gains	15	0
Marketable Securities, Equity, Unrealized Losses	(19)	(47)
Marketable Securities, Equity, Fair Value	362	227
Cash and Cash Equivalents	0	0
Current Marketable Securities	362	227
Non-Current Marketable Securities	0	0
U.S. Treasury securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	22,274	25,134
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	(1,354)	(1,725)
Marketable Securities, Debt, Fair Value	20,920	23,409
Cash and Cash Equivalents	0	338
Current Marketable Securities	8,076	5,091
Non-Current Marketable Securities	12,844	17,980
U.S. agency securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	5,709	5,823
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	(594)	(655)
Marketable Securities, Debt, Fair Value	5,115	5,168
Cash and Cash Equivalents	3	0
Current Marketable Securities	272	240
Non-Current Marketable Securities	4,840	4,928
Non-U.S. government securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	17,588	16,948
Marketable Securities, Debt, Unrealized Gains	19	2
Marketable Securities, Debt, Unrealized Losses	(927)	(1,201)
Marketable Securities, Debt, Fair Value	16,680	15,749
Cash and Cash Equivalents	0	0
Current Marketable Securities	11,262	8,806
Non-Current Marketable Securities	5,418	6,943
Certificates of deposit and time deposits | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	2,315	2,067
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	0	0
Marketable Securities, Debt, Fair Value	2,315	2,067
Cash and Cash Equivalents	1,960	1,805
Current Marketable Securities	355	262
Non-Current Marketable Securities	0	0
Commercial paper | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	364	718
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	0	0
Marketable Securities, Debt, Fair Value	364	718
Cash and Cash Equivalents	0	28
Current Marketable Securities	364	690
Non-Current Marketable Securities	0	0
Corporate debt securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	79,621	87,148
Marketable Securities, Debt, Unrealized Gains	22	9
Marketable Securities, Debt, Unrealized Losses	(6,079)	(7,707)
Marketable Securities, Debt, Fair Value	73,564	79,450
Cash and Cash Equivalents	0	0
Current Marketable Securities	13,005	9,023
Non-Current Marketable Securities	60,559	70,427
Municipal securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	713	921
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	(23)	(35)
Marketable Securities, Debt, Fair Value	690	886
Cash and Cash Equivalents	0	0
Current Marketable Securities	213	266
Non-Current Marketable Securities	477	620
Mortgage- and asset-backed securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	22,383	22,553
Marketable Securities, Debt, Unrealized Gains	4	0
Marketable Securities, Debt, Unrealized Losses	(2,299)	(2,593)
Marketable Securities, Debt, Fair Value	20,088	19,960
Cash and Cash Equivalents	0	0
Current Marketable Securities	165	53
Non-Current Marketable Securities	$ 19,923	$ 19,907