Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Millions |
Mar. 28, 2026 |
Sep. 27, 2025 |
| Marketable Securities [Line Items] |
|
|
| Cash, Cash Equivalents and Marketable Securities, Adjusted Cost |
$ 149,418
|
$ 134,711
|
| Cash Equivalents and Marketable Securities, Unrealized Gains |
334
|
736
|
| Cash Equivalents and Marketable Securities, Unrealized Losses |
(3,157)
|
(3,027)
|
| Cash, Cash Equivalents and Marketable Securities, Fair Value |
146,595
|
132,420
|
| Cash and Cash Equivalents |
45,572
|
35,934
|
| Current Marketable Securities |
22,935
|
18,763
|
| Non-Current
Marketable
Securities |
78,088
|
77,723
|
| Level 1 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Equity, Adjusted Cost |
7,409
|
5,951
|
| Marketable Securities, Equity, Unrealized Gains |
128
|
177
|
| Marketable Securities, Equity, Unrealized Losses |
(14)
|
(2)
|
| Marketable Securities, Equity, Fair Value |
7,523
|
6,126
|
| Cash and Cash Equivalents |
6,588
|
5,272
|
| Current Marketable Securities |
935
|
854
|
| Non-Current
Marketable
Securities |
0
|
0
|
| Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
112,269
|
100,493
|
| Marketable Securities, Debt, Unrealized Gains |
206
|
559
|
| Marketable Securities, Debt, Unrealized Losses |
(3,143)
|
(3,025)
|
| Marketable Securities, Debt, Fair Value |
109,332
|
98,027
|
| Cash and Cash Equivalents |
9,244
|
2,395
|
| Current Marketable Securities |
22,000
|
17,909
|
| Non-Current
Marketable
Securities |
78,088
|
77,723
|
| Cash |
|
|
| Marketable Securities [Line Items] |
|
|
| Cash |
29,740
|
28,267
|
| Cash and Cash Equivalents |
29,740
|
28,267
|
| Money market funds | Level 1 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Equity, Adjusted Cost |
6,588
|
5,272
|
| Marketable Securities, Equity, Unrealized Gains |
0
|
0
|
| Marketable Securities, Equity, Unrealized Losses |
0
|
0
|
| Marketable Securities, Equity, Fair Value |
6,588
|
5,272
|
| Cash and Cash Equivalents |
6,588
|
5,272
|
| Current Marketable Securities |
0
|
0
|
| Non-Current
Marketable
Securities |
0
|
0
|
| Mutual funds | Level 1 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Equity, Adjusted Cost |
821
|
679
|
| Marketable Securities, Equity, Unrealized Gains |
128
|
177
|
| Marketable Securities, Equity, Unrealized Losses |
(14)
|
(2)
|
| Marketable Securities, Equity, Fair Value |
935
|
854
|
| Cash and Cash Equivalents |
0
|
0
|
| Current Marketable Securities |
935
|
854
|
| Non-Current
Marketable
Securities |
0
|
0
|
| U.S. Treasury securities | Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
18,650
|
16,074
|
| Marketable Securities, Debt, Unrealized Gains |
14
|
56
|
| Marketable Securities, Debt, Unrealized Losses |
(254)
|
(282)
|
| Marketable Securities, Debt, Fair Value |
18,410
|
15,848
|
| Cash and Cash Equivalents |
2,935
|
1,190
|
| Current Marketable Securities |
4,174
|
3,712
|
| Non-Current
Marketable
Securities |
11,301
|
10,946
|
| U.S. agency securities | Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
7,483
|
5,269
|
| Marketable Securities, Debt, Unrealized Gains |
0
|
0
|
| Marketable Securities, Debt, Unrealized Losses |
(112)
|
(149)
|
| Marketable Securities, Debt, Fair Value |
7,371
|
5,120
|
| Cash and Cash Equivalents |
2,923
|
251
|
| Current Marketable Securities |
2,470
|
2,456
|
| Non-Current
Marketable
Securities |
1,978
|
2,413
|
| Non-U.S. government securities | Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
5,906
|
6,586
|
| Marketable Securities, Debt, Unrealized Gains |
45
|
111
|
| Marketable Securities, Debt, Unrealized Losses |
(493)
|
(424)
|
| Marketable Securities, Debt, Fair Value |
5,458
|
6,273
|
| Cash and Cash Equivalents |
0
|
0
|
| Current Marketable Securities |
576
|
855
|
| Non-Current
Marketable
Securities |
4,882
|
5,418
|
| Certificates of deposit and time deposits | Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
3,263
|
917
|
| Marketable Securities, Debt, Unrealized Gains |
0
|
0
|
| Marketable Securities, Debt, Unrealized Losses |
0
|
0
|
| Marketable Securities, Debt, Fair Value |
3,263
|
917
|
| Cash and Cash Equivalents |
2,987
|
904
|
| Current Marketable Securities |
276
|
0
|
| Non-Current
Marketable
Securities |
0
|
13
|
| Commercial paper | Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
3,628
|
100
|
| Marketable Securities, Debt, Unrealized Gains |
0
|
0
|
| Marketable Securities, Debt, Unrealized Losses |
0
|
0
|
| Marketable Securities, Debt, Fair Value |
3,628
|
100
|
| Cash and Cash Equivalents |
399
|
50
|
| Current Marketable Securities |
3,229
|
50
|
| Non-Current
Marketable
Securities |
0
|
0
|
| Corporate debt securities | Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
48,111
|
47,210
|
| Marketable Securities, Debt, Unrealized Gains |
83
|
266
|
| Marketable Securities, Debt, Unrealized Losses |
(982)
|
(916)
|
| Marketable Securities, Debt, Fair Value |
47,212
|
46,560
|
| Cash and Cash Equivalents |
0
|
0
|
| Current Marketable Securities |
11,042
|
10,623
|
| Non-Current
Marketable
Securities |
36,170
|
35,937
|
| Municipal securities | Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
122
|
207
|
| Marketable Securities, Debt, Unrealized Gains |
0
|
0
|
| Marketable Securities, Debt, Unrealized Losses |
(1)
|
(2)
|
| Marketable Securities, Debt, Fair Value |
121
|
205
|
| Cash and Cash Equivalents |
0
|
0
|
| Current Marketable Securities |
95
|
119
|
| Non-Current
Marketable
Securities |
26
|
86
|
| Mortgage- and asset-backed securities | Level 2 |
|
|
| Marketable Securities [Line Items] |
|
|
| Marketable Securities, Debt, Adjusted Cost |
25,106
|
24,130
|
| Marketable Securities, Debt, Unrealized Gains |
64
|
126
|
| Marketable Securities, Debt, Unrealized Losses |
(1,301)
|
(1,252)
|
| Marketable Securities, Debt, Fair Value |
23,869
|
23,004
|
| Cash and Cash Equivalents |
0
|
0
|
| Current Marketable Securities |
138
|
94
|
| Non-Current
Marketable
Securities |
$ 23,731
|
$ 22,910
|