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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 28, 2025 | Sep. 28, 2024
--- | --- | ---
Marketable Securities [Line Items] |  |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 136,270 | $ 160,600
Cash Equivalents and Marketable Securities, Unrealized Gains | 525 | 688
Cash Equivalents and Marketable Securities, Unrealized Losses | (3,809) | (4,638)
Cash, Cash Equivalents and Marketable Securities, Fair Value | 132,986 | 156,650
Cash and Cash Equivalents | 36,269 | 29,943
Current Marketable Securities | 19,103 | 35,228
Non-Current Marketable Securities | 77,614 | 91,479
Unfavorable investigation outcome, EU State Aid rules |  |
Marketable Securities [Line Items] |  |
Cash and cash equivalents held in escrow and restricted from general use |  | 2,600
Current marketable securities held in escrow and restricted from general use |  | 13,200
Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 4,425 | 1,293
Marketable Securities, Equity, Unrealized Gains | 134 | 105
Marketable Securities, Equity, Unrealized Losses | (3) | (3)
Marketable Securities, Equity, Fair Value | 4,556 | 1,395
Cash and Cash Equivalents | 3,779 | 778
Current Marketable Securities | 777 | 617
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 105,159 | 132,108
Marketable Securities, Debt, Unrealized Gains | 391 | 583
Marketable Securities, Debt, Unrealized Losses | (3,806) | (4,635)
Marketable Securities, Debt, Fair Value | 101,744 | 128,056
Cash and Cash Equivalents | 5,804 | 1,966
Current Marketable Securities | 18,326 | 34,611
Non-Current Marketable Securities | 77,614 | 91,479
Cash |  |
Marketable Securities [Line Items] |  |
Cash | 26,686 | 27,199
Cash and Cash Equivalents | 26,686 | 27,199
Money market funds | Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 3,779 | 778
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 3,779 | 778
Cash and Cash Equivalents | 3,779 | 778
Current Marketable Securities | 0 | 0
Non-Current Marketable Securities | 0 | 0
Mutual funds | Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 646 | 515
Marketable Securities, Equity, Unrealized Gains | 134 | 105
Marketable Securities, Equity, Unrealized Losses | (3) | (3)
Marketable Securities, Equity, Fair Value | 777 | 617
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 777 | 617
Non-Current Marketable Securities | 0 | 0
U.S. Treasury securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 15,775 | 16,150
Marketable Securities, Debt, Unrealized Gains | 46 | 45
Marketable Securities, Debt, Unrealized Losses | (362) | (516)
Marketable Securities, Debt, Fair Value | 15,459 | 15,679
Cash and Cash Equivalents | 1,030 | 212
Current Marketable Securities | 3,649 | 4,087
Non-Current Marketable Securities | 10,780 | 11,380
U.S. agency securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 5,383 | 5,431
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (189) | (272)
Marketable Securities, Debt, Fair Value | 5,194 | 5,159
Cash and Cash Equivalents | 647 | 155
Current Marketable Securities | 2,030 | 703
Non-Current Marketable Securities | 2,517 | 4,301
Non-U.S. government securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 6,756 | 17,959
Marketable Securities, Debt, Unrealized Gains | 43 | 93
Marketable Securities, Debt, Unrealized Losses | (567) | (484)
Marketable Securities, Debt, Fair Value | 6,232 | 17,568
Cash and Cash Equivalents | 297 | 1,158
Current Marketable Securities | 795 | 10,810
Non-Current Marketable Securities | 5,140 | 5,600
Certificates of deposit and time deposits | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 3,177 | 873
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 3,177 | 873
Cash and Cash Equivalents | 3,113 | 387
Current Marketable Securities | 51 | 478
Non-Current Marketable Securities | 13 | 8
Commercial paper | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 710 | 1,066
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 710 | 1,066
Cash and Cash Equivalents | 710 | 28
Current Marketable Securities | 0 | 1,038
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 49,671 | 65,622
Marketable Securities, Debt, Unrealized Gains | 212 | 270
Marketable Securities, Debt, Unrealized Losses | (1,251) | (1,953)
Marketable Securities, Debt, Fair Value | 48,632 | 63,939
Cash and Cash Equivalents | 7 | 26
Current Marketable Securities | 11,576 | 16,027
Non-Current Marketable Securities | 37,049 | 47,886
Municipal securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 263 | 412
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (3) | (7)
Marketable Securities, Debt, Fair Value | 260 | 405
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 157 | 190
Non-Current Marketable Securities | 103 | 215
Mortgage- and asset-backed securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 23,424 | 24,595
Marketable Securities, Debt, Unrealized Gains | 90 | 175
Marketable Securities, Debt, Unrealized Losses | (1,434) | (1,403)
Marketable Securities, Debt, Fair Value | 22,080 | 23,367
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 68 | 1,278
Non-Current Marketable Securities | $ 22,012 | $ 22,089

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