Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Sep. 28, 2024 | Sep. 30, 2023 |
Marketable Securities [Line Items] | | |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 160,600 | $ 173,752 |
Cash Equivalents and Marketable Securities, Unrealized Gains | 688 | 30 |
Cash Equivalents and Marketable Securities, Unrealized Loss | (4,638) | (11,683) |
Cash, Cash Equivalents and Marketable Securities, Fair Value | 156,650 | 162,099 |
Cash and Cash Equivalents | 29,943 | 29,965 |
Current Marketable Securities | 35,228 | 31,590 |
Non-Current Marketable Securities | 91,479 | 100,544 |
Total marketable securities that were restricted from general use | | 13,800 |
Unfavorable investigation outcome, EU State Aid rules | | |
Marketable Securities [Line Items] | | |
Cash and cash equivalents that were restricted from general use | 2,600 | |
Total marketable securities that were restricted from general use | 13,200 | |
Level 1 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Equity, Adjusted Cost | 1,293 | 923 |
Marketable Securities, Equity, Unrealized Gains | 105 | 12 |
Marketable Securities, Equity, Unrealized Losses | (3) | (26) |
Marketable Securities, Equity, Fair Value | 1,395 | 909 |
Cash and Cash Equivalents | 778 | 481 |
Current Marketable Securities | 617 | 428 |
Non-Current Marketable Securities | 0 | 0 |
Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 132,108 | 144,470 |
Marketable Securities, Debt, Unrealized Gains | 583 | 18 |
Marketable Securities, Debt, Unrealized Losses | (4,635) | (11,657) |
Marketable Securities, Debt, Fair Value | 128,056 | 132,831 |
Cash and Cash Equivalents | 1,966 | 1,125 |
Current Marketable Securities | 34,611 | 31,162 |
Non-Current Marketable Securities | 91,479 | 100,544 |
Cash | | |
Marketable Securities [Line Items] | | |
Cash | 27,199 | 28,359 |
Cash and Cash Equivalents | 27,199 | 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 | 778 | 481 |
Marketable Securities, Equity, Unrealized Gains | 0 | 0 |
Marketable Securities, Equity, Unrealized Losses | 0 | 0 |
Marketable Securities, Equity, Fair Value | 778 | 481 |
Cash and Cash Equivalents | 778 | 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 | 515 | |
Marketable Securities, Equity, Unrealized Gains | 105 | |
Marketable Securities, Equity, Unrealized Losses | (3) | |
Marketable Securities, Equity, Fair Value | 617 | |
Cash and Cash Equivalents | 0 | |
Current Marketable Securities | 617 | |
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 | 16,150 | 19,406 |
Marketable Securities, Debt, Unrealized Gains | 45 | 0 |
Marketable Securities, Debt, Unrealized Losses | (516) | (1,292) |
Marketable Securities, Debt, Fair Value | 15,679 | 18,114 |
Cash and Cash Equivalents | 212 | 35 |
Current Marketable Securities | 4,087 | 5,468 |
Non-Current Marketable Securities | 11,380 | 12,611 |
U.S. agency securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 5,431 | 5,736 |
Marketable Securities, Debt, Unrealized Gains | 0 | 0 |
Marketable Securities, Debt, Unrealized Losses | (272) | (600) |
Marketable Securities, Debt, Fair Value | 5,159 | 5,136 |
Cash and Cash Equivalents | 155 | 36 |
Current Marketable Securities | 703 | 271 |
Non-Current Marketable Securities | 4,301 | 4,829 |
Non-U.S. government securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 17,959 | 17,533 |
Marketable Securities, Debt, Unrealized Gains | 93 | 6 |
Marketable Securities, Debt, Unrealized Losses | (484) | (1,048) |
Marketable Securities, Debt, Fair Value | 17,568 | 16,491 |
Cash and Cash Equivalents | 1,158 | 0 |
Current Marketable Securities | 10,810 | 11,332 |
Non-Current Marketable Securities | 5,600 | 5,159 |
Certificates of deposit and time deposits | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 873 | 1,354 |
Marketable Securities, Debt, Unrealized Gains | 0 | 0 |
Marketable Securities, Debt, Unrealized Losses | 0 | 0 |
Marketable Securities, Debt, Fair Value | 873 | 1,354 |
Cash and Cash Equivalents | 387 | 1,034 |
Current Marketable Securities | 478 | 320 |
Non-Current Marketable Securities | 8 | 0 |
Commercial paper | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 1,066 | 608 |
Marketable Securities, Debt, Unrealized Gains | 0 | 0 |
Marketable Securities, Debt, Unrealized Losses | 0 | 0 |
Marketable Securities, Debt, Fair Value | 1,066 | 608 |
Cash and Cash Equivalents | 28 | 0 |
Current Marketable Securities | 1,038 | 608 |
Non-Current Marketable Securities | 0 | 0 |
Corporate debt securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 65,622 | 76,840 |
Marketable Securities, Debt, Unrealized Gains | 270 | 6 |
Marketable Securities, Debt, Unrealized Losses | (1,953) | (5,956) |
Marketable Securities, Debt, Fair Value | 63,939 | 70,890 |
Cash and Cash Equivalents | 26 | 20 |
Current Marketable Securities | 16,027 | 12,627 |
Non-Current Marketable Securities | 47,886 | 58,243 |
Municipal securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 412 | 628 |
Marketable Securities, Debt, Unrealized Gains | 0 | 0 |
Marketable Securities, Debt, Unrealized Losses | (7) | (26) |
Marketable Securities, Debt, Fair Value | 405 | 602 |
Cash and Cash Equivalents | 0 | 0 |
Current Marketable Securities | 190 | 192 |
Non-Current Marketable Securities | 215 | 410 |
Mortgage- and asset-backed securities | Level 2 | | |
Marketable Securities [Line Items] | | |
Marketable Securities, Debt, Adjusted Cost | 24,595 | 22,365 |
Marketable Securities, Debt, Unrealized Gains | 175 | 6 |
Marketable Securities, Debt, Unrealized Losses | (1,403) | (2,735) |
Marketable Securities, Debt, Fair Value | 23,367 | 19,636 |
Cash and Cash Equivalents | 0 | 0 |
Current Marketable Securities | 1,278 | 344 |
Non-Current Marketable Securities | $ 22,089 | $ 19,292 |