Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 24, 2022
Marketable Securities [Line Items]
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost	$ 173,752	$ 183,061
Cash Equivalents and Marketable Securities, Unrealized Gains	30	11
Cash Equivalents and Marketable Securities, Unrealized Loss	(11,683)	(13,963)
Cash, Cash Equivalents and Marketable Securities, Fair Value	162,099	169,109
Cash and Cash Equivalents	29,965	23,646
Current Marketable Securities	31,590	24,658
Non-Current Marketable Securities	100,544	120,805
Total marketable securities that were restricted from general use	13,800	12,700
Level 1
Marketable Securities [Line Items]
Marketable Securities, Equity, Adjusted Cost	923	3,203
Marketable Securities, Equity, Unrealized Gains	12	0
Marketable Securities, Equity, Unrealized Losses	(26)	(47)
Marketable Securities, Equity, Fair Value	909	3,156
Cash and Cash Equivalents	481	2,929
Current Marketable Securities	428	227
Non-Current Marketable Securities	0	0
Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	144,470	161,312
Marketable Securities, Debt, Unrealized Gains	18	11
Marketable Securities, Debt, Unrealized Losses	(11,657)	(13,916)
Marketable Securities, Debt, Fair Value	132,831	147,407
Cash and Cash Equivalents	1,125	2,171
Current Marketable Securities	31,162	24,431
Non-Current Marketable Securities	100,544	120,805
Cash
Marketable Securities [Line Items]
Cash	28,359	18,546
Cash and Cash Equivalents	28,359	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	481	2,929
Marketable Securities, Equity, Unrealized Gains	0	0
Marketable Securities, Equity, Unrealized Losses	0	0
Marketable Securities, Equity, Fair Value	481	2,929
Cash and Cash Equivalents	481	2,929
Current Marketable Securities	0	0
Non-Current Marketable Securities	0	0
Mutual funds and equity securities | Level 1
Marketable Securities [Line Items]
Marketable Securities, Equity, Adjusted Cost	442
Marketable Securities, Equity, Unrealized Gains	12
Marketable Securities, Equity, Unrealized Losses	(26)
Marketable Securities, Equity, Fair Value	428
Cash and Cash Equivalents	0
Current Marketable Securities	428
Non-Current Marketable Securities	0
Mutual funds | Level 1
Marketable Securities [Line Items]
Marketable Securities, Equity, Adjusted Cost		274
Marketable Securities, Equity, Unrealized Gains		0
Marketable Securities, Equity, Unrealized Losses		(47)
Marketable Securities, Equity, Fair Value		227
Cash and Cash Equivalents		0
Current Marketable Securities		227
Non-Current Marketable Securities		0
U.S. Treasury securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	19,406	25,134
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	(1,292)	(1,725)
Marketable Securities, Debt, Fair Value	18,114	23,409
Cash and Cash Equivalents	35	338
Current Marketable Securities	5,468	5,091
Non-Current Marketable Securities	12,611	17,980
U.S. agency securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	5,736	5,823
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	(600)	(655)
Marketable Securities, Debt, Fair Value	5,136	5,168
Cash and Cash Equivalents	36	0
Current Marketable Securities	271	240
Non-Current Marketable Securities	4,829	4,928
Non-U.S. government securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	17,533	16,948
Marketable Securities, Debt, Unrealized Gains	6	2
Marketable Securities, Debt, Unrealized Losses	(1,048)	(1,201)
Marketable Securities, Debt, Fair Value	16,491	15,749
Cash and Cash Equivalents	0	0
Current Marketable Securities	11,332	8,806
Non-Current Marketable Securities	5,159	6,943
Certificates of deposit and time deposits | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	1,354	2,067
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	0	0
Marketable Securities, Debt, Fair Value	1,354	2,067
Cash and Cash Equivalents	1,034	1,805
Current Marketable Securities	320	262
Non-Current Marketable Securities	0	0
Commercial paper | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	608	718
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	0	0
Marketable Securities, Debt, Fair Value	608	718
Cash and Cash Equivalents	0	28
Current Marketable Securities	608	690
Non-Current Marketable Securities	0	0
Corporate debt securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	76,840	87,148
Marketable Securities, Debt, Unrealized Gains	6	9
Marketable Securities, Debt, Unrealized Losses	(5,956)	(7,707)
Marketable Securities, Debt, Fair Value	70,890	79,450
Cash and Cash Equivalents	20	0
Current Marketable Securities	12,627	9,023
Non-Current Marketable Securities	58,243	70,427
Municipal securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	628	921
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	(26)	(35)
Marketable Securities, Debt, Fair Value	602	886
Cash and Cash Equivalents	0	0
Current Marketable Securities	192	266
Non-Current Marketable Securities	410	620
Mortgage- and asset-backed securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	22,365	22,553
Marketable Securities, Debt, Unrealized Gains	6	0
Marketable Securities, Debt, Unrealized Losses	(2,735)	(2,593)
Marketable Securities, Debt, Fair Value	19,636	19,960
Cash and Cash Equivalents	0	0
Current Marketable Securities	344	53
Non-Current Marketable Securities	$ 19,292	$ 19,907