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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 29, 2024 | Sep. 30, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 160,230 | $ 173,752
Cash Equivalents and Marketable Securities, Unrealized Gains | 220 | 30
Cash Equivalents and Marketable Securities, Unrealized Losses | (7,409) | (11,683)
Cash, Cash Equivalents and Marketable Securities, Fair Value | 153,041 | 162,099
Cash and Cash Equivalents | 25,565 | 29,965
Current Marketable Securities | 36,236 | 31,590
Non-Current Marketable Securities | 91,240 | 100,544
Total marketable securities that were restricted from general use | 14,100 | 13,800
Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 2,141 | 923
Marketable Securities, Equity, Unrealized Gains | 76 | 12
Marketable Securities, Equity, Unrealized Losses | (7) | (26)
Marketable Securities, Equity, Fair Value | 2,210 | 909
Cash and Cash Equivalents | 1,648 | 481
Current Marketable Securities | 562 | 428
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 135,223 | 144,470
Marketable Securities, Debt, Unrealized Gains | 144 | 18
Marketable Securities, Debt, Unrealized Losses | (7,402) | (11,657)
Marketable Securities, Debt, Fair Value | 127,965 | 132,831
Cash and Cash Equivalents | 1,051 | 1,125
Current Marketable Securities | 35,674 | 31,162
Non-Current Marketable Securities | 91,240 | 100,544
Cash |  |
Marketable Securities [Line Items] |  |
Cash | 22,866 | 28,359
Cash and Cash Equivalents | 22,866 | 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 | 1,648 | 481
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 1,648 | 481
Cash and Cash Equivalents | 1,648 | 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 | 493 |
Marketable Securities, Equity, Unrealized Gains | 76 |
Marketable Securities, Equity, Unrealized Losses | (7) |
Marketable Securities, Equity, Fair Value | 562 |
Cash and Cash Equivalents | 0 |
Current Marketable Securities | 562 |
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 | 16,298 | 19,406
Marketable Securities, Debt, Unrealized Gains | 3 | 0
Marketable Securities, Debt, Unrealized Losses | (855) | (1,292)
Marketable Securities, Debt, Fair Value | 15,446 | 18,114
Cash and Cash Equivalents | 138 | 35
Current Marketable Securities | 4,649 | 5,468
Non-Current Marketable Securities | 10,659 | 12,611
U.S. agency securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 5,500 | 5,736
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (418) | (600)
Marketable Securities, Debt, Fair Value | 5,082 | 5,136
Cash and Cash Equivalents | 73 | 36
Current Marketable Securities | 518 | 271
Non-Current Marketable Securities | 4,491 | 4,829
Non-U.S. government securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 17,560 | 17,533
Marketable Securities, Debt, Unrealized Gains | 31 | 6
Marketable Securities, Debt, Unrealized Losses | (680) | (1,048)
Marketable Securities, Debt, Fair Value | 16,911 | 16,491
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 11,592 | 11,332
Non-Current Marketable Securities | 5,319 | 5,159
Certificates of deposit and time deposits | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 1,337 | 1,354
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 1,337 | 1,354
Cash and Cash Equivalents | 838 | 1,034
Current Marketable Securities | 492 | 320
Non-Current Marketable Securities | 7 | 0
Commercial paper | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 1,346 | 608
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 1,346 | 608
Cash and Cash Equivalents | 2 | 0
Current Marketable Securities | 1,344 | 608
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 68,194 | 76,840
Marketable Securities, Debt, Unrealized Gains | 83 | 6
Marketable Securities, Debt, Unrealized Losses | (3,350) | (5,956)
Marketable Securities, Debt, Fair Value | 64,927 | 70,890
Cash and Cash Equivalents | 0 | 20
Current Marketable Securities | 15,489 | 12,627
Non-Current Marketable Securities | 49,438 | 58,243
Municipal securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 480 | 628
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (13) | (26)
Marketable Securities, Debt, Fair Value | 467 | 602
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 197 | 192
Non-Current Marketable Securities | 270 | 410
Mortgage- and asset-backed securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 24,508 | 22,365
Marketable Securities, Debt, Unrealized Gains | 27 | 6
Marketable Securities, Debt, Unrealized Losses | (2,086) | (2,735)
Marketable Securities, Debt, Fair Value | 22,449 | 19,636
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 1,393 | 344
Non-Current Marketable Securities | $ 21,056 | $ 19,292

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