Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Dec. 30, 2023	Sep. 30, 2023
Marketable Securities [Line Items]
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost	$ 180,248	$ 173,752
Cash Equivalents and Marketable Securities, Unrealized Gains	266	30
Cash Equivalents and Marketable Securities, Unrealized Losses	(7,939)	(11,683)
Cash, Cash Equivalents and Marketable Securities, Fair Value	172,575	162,099
Cash and Cash Equivalents	40,760	29,965
Current Marketable Securities	32,340	31,590
Non-Current Marketable Securities	99,475	100,544
Total marketable securities that were restricted from general use	13,900	13,800
Level 1
Marketable Securities [Line Items]
Marketable Securities, Equity, Adjusted Cost	2,448	923
Marketable Securities, Equity, Unrealized Gains	35	12
Marketable Securities, Equity, Unrealized Losses	(11)	(26)
Marketable Securities, Equity, Fair Value	2,472	909
Cash and Cash Equivalents	2,000	481
Current Marketable Securities	472	428
Non-Current Marketable Securities	0	0
Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	148,258	144,470
Marketable Securities, Debt, Unrealized Gains	231	18
Marketable Securities, Debt, Unrealized Losses	(7,928)	(11,657)
Marketable Securities, Debt, Fair Value	140,561	132,831
Cash and Cash Equivalents	9,218	1,125
Current Marketable Securities	31,868	31,162
Non-Current Marketable Securities	99,475	100,544
Cash
Marketable Securities [Line Items]
Cash	29,542	28,359
Cash and Cash Equivalents	29,542	28,359
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	2,000	481
Marketable Securities, Equity, Unrealized Gains	0	0
Marketable Securities, Equity, Unrealized Losses	0	0
Marketable Securities, Equity, Fair Value	2,000	481
Cash and Cash Equivalents	2,000	481
Current Marketable Securities	0	0
Non-Current Marketable Securities	0	0
Mutual funds | Level 1
Marketable Securities [Line Items]
Marketable Securities, Equity, Adjusted Cost	448
Marketable Securities, Equity, Unrealized Gains	35
Marketable Securities, Equity, Unrealized Losses	(11)
Marketable Securities, Equity, Fair Value	472
Cash and Cash Equivalents	0
Current Marketable Securities	472
Non-Current Marketable Securities	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
U.S. Treasury securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	24,041	19,406
Marketable Securities, Debt, Unrealized Gains	12	0
Marketable Securities, Debt, Unrealized Losses	(920)	(1,292)
Marketable Securities, Debt, Fair Value	23,133	18,114
Cash and Cash Equivalents	7,303	35
Current Marketable Securities	4,858	5,468
Non-Current Marketable Securities	10,972	12,611
U.S. agency securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	5,791	5,736
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	(448)	(600)
Marketable Securities, Debt, Fair Value	5,343	5,136
Cash and Cash Equivalents	243	36
Current Marketable Securities	98	271
Non-Current Marketable Securities	5,002	4,829
Non-U.S. government securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	17,326	17,533
Marketable Securities, Debt, Unrealized Gains	54	6
Marketable Securities, Debt, Unrealized Losses	(675)	(1,048)
Marketable Securities, Debt, Fair Value	16,705	16,491
Cash and Cash Equivalents	0	0
Current Marketable Securities	11,175	11,332
Non-Current Marketable Securities	5,530	5,159
Certificates of deposit and time deposits | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	1,448	1,354
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	0	0
Marketable Securities, Debt, Fair Value	1,448	1,354
Cash and Cash Equivalents	1,119	1,034
Current Marketable Securities	329	320
Non-Current Marketable Securities	0	0
Commercial paper | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	1,361	608
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	0	0
Marketable Securities, Debt, Fair Value	1,361	608
Cash and Cash Equivalents	472	0
Current Marketable Securities	889	608
Non-Current Marketable Securities	0	0
Corporate debt securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	75,360	76,840
Marketable Securities, Debt, Unrealized Gains	112	6
Marketable Securities, Debt, Unrealized Losses	(3,964)	(5,956)
Marketable Securities, Debt, Fair Value	71,508	70,890
Cash and Cash Equivalents	81	20
Current Marketable Securities	13,909	12,627
Non-Current Marketable Securities	57,518	58,243
Municipal securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	562	628
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	(14)	(26)
Marketable Securities, Debt, Fair Value	548	602
Cash and Cash Equivalents	0	0
Current Marketable Securities	185	192
Non-Current Marketable Securities	363	410
Mortgage- and asset-backed securities | Level 2
Marketable Securities [Line Items]
Marketable Securities, Debt, Adjusted Cost	22,369	22,365
Marketable Securities, Debt, Unrealized Gains	53	6
Marketable Securities, Debt, Unrealized Losses	(1,907)	(2,735)
Marketable Securities, Debt, Fair Value	20,515	19,636
Cash and Cash Equivalents	0	0
Current Marketable Securities	425	344
Non-Current Marketable Securities	$ 20,090	$ 19,292