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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Mar. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 169,913 | $ 173,752
Cash Equivalents and Marketable Securities, Unrealized Gains | 231 | 30
Cash Equivalents and Marketable Securities, Unrealized Losses | (7,807) | (11,683)
Cash, Cash Equivalents and Marketable Securities, Fair Value | 162,337 | 162,099
Cash and Cash Equivalents | 32,695 | 29,965
Current Marketable Securities | 34,455 | 31,590
Non-Current Marketable Securities | 95,187 | 100,544
Total marketable securities that were restricted from general use | 14,000 | 13,800
Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 1,817 | 923
Marketable Securities, Equity, Unrealized Gains | 66 | 12
Marketable Securities, Equity, Unrealized Losses | (7) | (26)
Marketable Securities, Equity, Fair Value | 1,876 | 909
Cash and Cash Equivalents | 1,353 | 481
Current Marketable Securities | 523 | 428
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 139,869 | 144,470
Marketable Securities, Debt, Unrealized Gains | 165 | 18
Marketable Securities, Debt, Unrealized Losses | (7,800) | (11,657)
Marketable Securities, Debt, Fair Value | 132,234 | 132,831
Cash and Cash Equivalents | 3,115 | 1,125
Current Marketable Securities | 33,932 | 31,162
Non-Current Marketable Securities | 95,187 | 100,544
Cash |  |
Marketable Securities [Line Items] |  |
Cash | 28,227 | 28,359
Cash and Cash Equivalents | 28,227 | 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 | 1,353 | 481
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 1,353 | 481
Cash and Cash Equivalents | 1,353 | 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 | 464 |
Marketable Securities, Equity, Unrealized Gains | 66 |
Marketable Securities, Equity, Unrealized Losses | (7) |
Marketable Securities, Equity, Fair Value | 523 |
Cash and Cash Equivalents | 0 |
Current Marketable Securities | 523 |
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 | 18,150 | 19,406
Marketable Securities, Debt, Unrealized Gains | 1 | 0
Marketable Securities, Debt, Unrealized Losses | (933) | (1,292)
Marketable Securities, Debt, Fair Value | 17,218 | 18,114
Cash and Cash Equivalents | 1,895 | 35
Current Marketable Securities | 4,133 | 5,468
Non-Current Marketable Securities | 11,190 | 12,611
U.S. agency securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 5,775 | 5,736
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (446) | (600)
Marketable Securities, Debt, Fair Value | 5,329 | 5,136
Cash and Cash Equivalents | 233 | 36
Current Marketable Securities | 581 | 271
Non-Current Marketable Securities | 4,515 | 4,829
Non-U.S. government securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 17,319 | 17,533
Marketable Securities, Debt, Unrealized Gains | 37 | 6
Marketable Securities, Debt, Unrealized Losses | (666) | (1,048)
Marketable Securities, Debt, Fair Value | 16,690 | 16,491
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 11,289 | 11,332
Non-Current Marketable Securities | 5,401 | 5,159
Certificates of deposit and time deposits | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 976 | 1,354
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 976 | 1,354
Cash and Cash Equivalents | 656 | 1,034
Current Marketable Securities | 320 | 320
Non-Current Marketable Securities | 0 | 0
Commercial paper | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 1,482 | 608
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 1,482 | 608
Cash and Cash Equivalents | 274 | 0
Current Marketable Securities | 1,208 | 608
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 71,612 | 76,840
Marketable Securities, Debt, Unrealized Gains | 90 | 6
Marketable Securities, Debt, Unrealized Losses | (3,694) | (5,956)
Marketable Securities, Debt, Fair Value | 68,008 | 70,890
Cash and Cash Equivalents | 57 | 20
Current Marketable Securities | 15,096 | 12,627
Non-Current Marketable Securities | 52,855 | 58,243
Municipal securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 511 | 628
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (15) | (26)
Marketable Securities, Debt, Fair Value | 496 | 602
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 188 | 192
Non-Current Marketable Securities | 308 | 410
Mortgage- and asset-backed securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 24,044 | 22,365
Marketable Securities, Debt, Unrealized Gains | 37 | 6
Marketable Securities, Debt, Unrealized Losses | (2,046) | (2,735)
Marketable Securities, Debt, Fair Value | 22,035 | 19,636
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 1,117 | 344
Non-Current Marketable Securities | $ 20,918 | $ 19,292

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