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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Mar. 29, 2025 | Sep. 28, 2024
--- | --- | ---
Marketable Securities [Line Items] |  |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 137,088 | $ 160,600
Cash Equivalents and Marketable Securities, Unrealized Gains | 376 | 688
Cash Equivalents and Marketable Securities, Unrealized Losses | (4,542) | (4,638)
Cash, Cash Equivalents and Marketable Securities, Fair Value | 132,922 | 156,650
Cash and Cash Equivalents | 28,162 | 29,943
Current Marketable Securities | 20,336 | 35,228
Non-Current Marketable Securities | 84,424 | 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 | 1,744 | 1,293
Marketable Securities, Equity, Unrealized Gains | 81 | 105
Marketable Securities, Equity, Unrealized Losses | (11) | (3)
Marketable Securities, Equity, Fair Value | 1,814 | 1,395
Cash and Cash Equivalents | 1,132 | 778
Current Marketable Securities | 682 | 617
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 110,283 | 132,108
Marketable Securities, Debt, Unrealized Gains | 295 | 583
Marketable Securities, Debt, Unrealized Losses | (4,531) | (4,635)
Marketable Securities, Debt, Fair Value | 106,047 | 128,056
Cash and Cash Equivalents | 1,969 | 1,966
Current Marketable Securities | 19,654 | 34,611
Non-Current Marketable Securities | 84,424 | 91,479
Cash |  |
Marketable Securities [Line Items] |  |
Cash | 25,061 | 27,199
Cash and Cash Equivalents | 25,061 | 27,199
Money market funds | Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 1,132 | 778
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 1,132 | 778
Cash and Cash Equivalents | 1,132 | 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 | 612 | 515
Marketable Securities, Equity, Unrealized Gains | 81 | 105
Marketable Securities, Equity, Unrealized Losses | (11) | (3)
Marketable Securities, Equity, Fair Value | 682 | 617
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 682 | 617
Non-Current Marketable Securities | 0 | 0
U.S. Treasury securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 14,509 | 16,150
Marketable Securities, Debt, Unrealized Gains | 24 | 45
Marketable Securities, Debt, Unrealized Losses | (445) | (516)
Marketable Securities, Debt, Fair Value | 14,088 | 15,679
Cash and Cash Equivalents | 124 | 212
Current Marketable Securities | 4,088 | 4,087
Non-Current Marketable Securities | 9,876 | 11,380
U.S. agency securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 4,889 | 5,431
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (233) | (272)
Marketable Securities, Debt, Fair Value | 4,656 | 5,159
Cash and Cash Equivalents | 66 | 155
Current Marketable Securities | 2,004 | 703
Non-Current Marketable Securities | 2,586 | 4,301
Non-U.S. government securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 6,351 | 17,959
Marketable Securities, Debt, Unrealized Gains | 29 | 93
Marketable Securities, Debt, Unrealized Losses | (625) | (484)
Marketable Securities, Debt, Fair Value | 5,755 | 17,568
Cash and Cash Equivalents | 0 | 1,158
Current Marketable Securities | 529 | 10,810
Non-Current Marketable Securities | 5,226 | 5,600
Certificates of deposit and time deposits | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 1,744 | 873
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 1,744 | 873
Cash and Cash Equivalents | 1,731 | 387
Current Marketable Securities | 0 | 478
Non-Current Marketable Securities | 13 | 8
Commercial paper | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 2 | 1,066
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 2 | 1,066
Cash and Cash Equivalents | 0 | 28
Current Marketable Securities | 2 | 1,038
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 55,743 | 65,622
Marketable Securities, Debt, Unrealized Gains | 121 | 270
Marketable Securities, Debt, Unrealized Losses | (1,672) | (1,953)
Marketable Securities, Debt, Fair Value | 54,192 | 63,939
Cash and Cash Equivalents | 48 | 26
Current Marketable Securities | 12,412 | 16,027
Non-Current Marketable Securities | 41,732 | 47,886
Municipal securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 303 | 412
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (5) | (7)
Marketable Securities, Debt, Fair Value | 298 | 405
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 170 | 190
Non-Current Marketable Securities | 128 | 215
Mortgage- and asset-backed securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 26,742 | 24,595
Marketable Securities, Debt, Unrealized Gains | 121 | 175
Marketable Securities, Debt, Unrealized Losses | (1,551) | (1,403)
Marketable Securities, Debt, Fair Value | 25,312 | 23,367
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 449 | 1,278
Non-Current Marketable Securities | $ 24,863 | $ 22,089

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