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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Dec. 30, 2023 | Sep. 30, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 180,248 | $ 173,752
Cash Equivalents and Marketable Securities, Unrealized Gains | 266 | 30
Cash Equivalents and Marketable Securities, Unrealized Losses | (7,939) | (11,683)
Cash, Cash Equivalents and Marketable Securities, Fair Value | 172,575 | 162,099
Cash and Cash Equivalents | 40,760 | 29,965
Current Marketable Securities | 32,340 | 31,590
Non-Current Marketable Securities | 99,475 | 100,544
Total marketable securities that were restricted from general use | 13,900 | 13,800
Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 2,448 | 923
Marketable Securities, Equity, Unrealized Gains | 35 | 12
Marketable Securities, Equity, Unrealized Losses | (11) | (26)
Marketable Securities, Equity, Fair Value | 2,472 | 909
Cash and Cash Equivalents | 2,000 | 481
Current Marketable Securities | 472 | 428
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 148,258 | 144,470
Marketable Securities, Debt, Unrealized Gains | 231 | 18
Marketable Securities, Debt, Unrealized Losses | (7,928) | (11,657)
Marketable Securities, Debt, Fair Value | 140,561 | 132,831
Cash and Cash Equivalents | 9,218 | 1,125
Current Marketable Securities | 31,868 | 31,162
Non-Current Marketable Securities | 99,475 | 100,544
Cash |  |
Marketable Securities [Line Items] |  |
Cash | 29,542 | 28,359
Cash and Cash Equivalents | 29,542 | 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 | 2,000 | 481
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 2,000 | 481
Cash and Cash Equivalents | 2,000 | 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 | 448 |
Marketable Securities, Equity, Unrealized Gains | 35 |
Marketable Securities, Equity, Unrealized Losses | (11) |
Marketable Securities, Equity, Fair Value | 472 |
Cash and Cash Equivalents | 0 |
Current Marketable Securities | 472 |
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 | 24,041 | 19,406
Marketable Securities, Debt, Unrealized Gains | 12 | 0
Marketable Securities, Debt, Unrealized Losses | (920) | (1,292)
Marketable Securities, Debt, Fair Value | 23,133 | 18,114
Cash and Cash Equivalents | 7,303 | 35
Current Marketable Securities | 4,858 | 5,468
Non-Current Marketable Securities | 10,972 | 12,611
U.S. agency securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 5,791 | 5,736
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (448) | (600)
Marketable Securities, Debt, Fair Value | 5,343 | 5,136
Cash and Cash Equivalents | 243 | 36
Current Marketable Securities | 98 | 271
Non-Current Marketable Securities | 5,002 | 4,829
Non-U.S. government securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 17,326 | 17,533
Marketable Securities, Debt, Unrealized Gains | 54 | 6
Marketable Securities, Debt, Unrealized Losses | (675) | (1,048)
Marketable Securities, Debt, Fair Value | 16,705 | 16,491
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 11,175 | 11,332
Non-Current Marketable Securities | 5,530 | 5,159
Certificates of deposit and time deposits | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 1,448 | 1,354
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 1,448 | 1,354
Cash and Cash Equivalents | 1,119 | 1,034
Current Marketable Securities | 329 | 320
Non-Current Marketable Securities | 0 | 0
Commercial paper | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 1,361 | 608
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 1,361 | 608
Cash and Cash Equivalents | 472 | 0
Current Marketable Securities | 889 | 608
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 75,360 | 76,840
Marketable Securities, Debt, Unrealized Gains | 112 | 6
Marketable Securities, Debt, Unrealized Losses | (3,964) | (5,956)
Marketable Securities, Debt, Fair Value | 71,508 | 70,890
Cash and Cash Equivalents | 81 | 20
Current Marketable Securities | 13,909 | 12,627
Non-Current Marketable Securities | 57,518 | 58,243
Municipal securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 562 | 628
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (14) | (26)
Marketable Securities, Debt, Fair Value | 548 | 602
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 185 | 192
Non-Current Marketable Securities | 363 | 410
Mortgage- and asset-backed securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 22,369 | 22,365
Marketable Securities, Debt, Unrealized Gains | 53 | 6
Marketable Securities, Debt, Unrealized Losses | (1,907) | (2,735)
Marketable Securities, Debt, Fair Value | 20,515 | 19,636
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 425 | 344
Non-Current Marketable Securities | $ 20,090 | $ 19,292

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