Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Dec. 28, 2024 | Sep. 28, 2024 |
Marketable Securities [Line Items] | | |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 147,088 | $ 160,600 |
Cash Equivalents and Marketable Securities, Unrealized Gains | 261 | 688 |
Cash Equivalents and Marketable Securities, Unrealized Losses | (5,981) | (4,638) |
Cash, Cash Equivalents and Marketable Securities, Fair Value | 141,368 | 156,650 |
Cash and Cash Equivalents | 30,299 | 29,943 |
Current Marketable Securities | 23,476 | 35,228 |
Non-Current Marketable Securities | 87,593 | 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 | 126 | 2,600 |
Current marketable securities held in escrow and restricted from general use | 3,300 | 13,200 |
Level 1 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Equity, Adjusted Cost | 1,534 | 1,293 |
Marketable Securities, Equity, Unrealized Gains | 109 | 105 |
Marketable Securities, Equity, Unrealized Losses | (7) | (3) |
Marketable Securities, Equity, Fair Value | 1,636 | 1,395 |
Cash and Cash Equivalents | 937 | 778 |
Current Marketable Securities | 699 | 617 |
Non-Current Marketable Securities | 0 | 0 |
Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 118,481 | 132,108 |
Marketable Securities, Debt, Unrealized Gains | 152 | 583 |
Marketable Securities, Debt, Unrealized Losses | (5,974) | (4,635) |
Marketable Securities, Debt, Fair Value | 112,659 | 128,056 |
Cash and Cash Equivalents | 2,289 | 1,966 |
Current Marketable Securities | 22,777 | 34,611 |
Non-Current Marketable Securities | 87,593 | 91,479 |
Cash | | |
Marketable Securities [Line Items] | | |
Cash | 27,073 | 27,199 |
Cash and Cash Equivalents | 27,073 | 27,199 |
Money market funds | Level 1 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Equity, Adjusted Cost | 937 | 778 |
Marketable Securities, Equity, Unrealized Gains | 0 | 0 |
Marketable Securities, Equity, Unrealized Losses | 0 | 0 |
Marketable Securities, Equity, Fair Value | 937 | 778 |
Cash and Cash Equivalents | 937 | 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 | 597 | 515 |
Marketable Securities, Equity, Unrealized Gains | 109 | 105 |
Marketable Securities, Equity, Unrealized Losses | (7) | (3) |
Marketable Securities, Equity, Fair Value | 699 | 617 |
Cash and Cash Equivalents | 0 | 0 |
Current Marketable Securities | 699 | 617 |
Non-Current Marketable Securities | 0 | 0 |
U.S. Treasury securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 15,516 | 16,150 |
Marketable Securities, Debt, Unrealized Gains | 5 | 45 |
Marketable Securities, Debt, Unrealized Losses | (616) | (516) |
Marketable Securities, Debt, Fair Value | 14,905 | 15,679 |
Cash and Cash Equivalents | 903 | 212 |
Current Marketable Securities | 2,718 | 4,087 |
Non-Current Marketable Securities | 11,284 | 11,380 |
U.S. agency securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 5,570 | 5,431 |
Marketable Securities, Debt, Unrealized Gains | 0 | 0 |
Marketable Securities, Debt, Unrealized Losses | (303) | (272) |
Marketable Securities, Debt, Fair Value | 5,267 | 5,159 |
Cash and Cash Equivalents | 314 | 155 |
Current Marketable Securities | 1,683 | 703 |
Non-Current Marketable Securities | 3,270 | 4,301 |
Non-U.S. government securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 8,596 | 17,959 |
Marketable Securities, Debt, Unrealized Gains | 22 | 93 |
Marketable Securities, Debt, Unrealized Losses | (819) | (484) |
Marketable Securities, Debt, Fair Value | 7,799 | 17,568 |
Cash and Cash Equivalents | 50 | 1,158 |
Current Marketable Securities | 2,524 | 10,810 |
Non-Current Marketable Securities | 5,225 | 5,600 |
Certificates of deposit and time deposits | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 1,147 | 873 |
Marketable Securities, Debt, Unrealized Gains | 0 | 0 |
Marketable Securities, Debt, Unrealized Losses | (13) | 0 |
Marketable Securities, Debt, Fair Value | 1,134 | 873 |
Cash and Cash Equivalents | 874 | 387 |
Current Marketable Securities | 247 | 478 |
Non-Current Marketable Securities | 13 | 8 |
Commercial paper | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 418 | 1,066 |
Marketable Securities, Debt, Unrealized Gains | 0 | 0 |
Marketable Securities, Debt, Unrealized Losses | (19) | 0 |
Marketable Securities, Debt, Fair Value | 399 | 1,066 |
Cash and Cash Equivalents | 101 | 28 |
Current Marketable Securities | 298 | 1,038 |
Non-Current Marketable Securities | 0 | 0 |
Corporate debt securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 61,566 | 65,622 |
Marketable Securities, Debt, Unrealized Gains | 96 | 270 |
Marketable Securities, Debt, Unrealized Losses | (2,210) | (1,953) |
Marketable Securities, Debt, Fair Value | 59,452 | 63,939 |
Cash and Cash Equivalents | 47 | 26 |
Current Marketable Securities | 14,451 | 16,027 |
Non-Current Marketable Securities | 44,954 | 47,886 |
Municipal securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 355 | 412 |
Marketable Securities, Debt, Unrealized Gains | 0 | 0 |
Marketable Securities, Debt, Unrealized Losses | (7) | (7) |
Marketable Securities, Debt, Fair Value | 348 | 405 |
Cash and Cash Equivalents | 0 | 0 |
Current Marketable Securities | 189 | 190 |
Non-Current Marketable Securities | 159 | 215 |
Mortgage- and asset-backed securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 25,313 | 24,595 |
Marketable Securities, Debt, Unrealized Gains | 29 | 175 |
Marketable Securities, Debt, Unrealized Losses | (1,987) | (1,403) |
Marketable Securities, Debt, Fair Value | 23,355 | 23,367 |
Cash and Cash Equivalents | 0 | 0 |
Current Marketable Securities | 667 | 1,278 |
Non-Current Marketable Securities | $ 22,688 | $ 22,089 |