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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 24, 2022
--- | --- | ---
Marketable Securities [Line Items] |  |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 173,752 | $ 183,061
Cash Equivalents and Marketable Securities, Unrealized Gains | 30 | 11
Cash Equivalents and Marketable Securities, Unrealized Loss | (11,683) | (13,963)
Cash, Cash Equivalents and Marketable Securities, Fair Value | 162,099 | 169,109
Cash and Cash Equivalents | 29,965 | 23,646
Current Marketable Securities | 31,590 | 24,658
Non-Current Marketable Securities | 100,544 | 120,805
Total marketable securities that were restricted from general use | 13,800 | 12,700
Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 923 | 3,203
Marketable Securities, Equity, Unrealized Gains | 12 | 0
Marketable Securities, Equity, Unrealized Losses | (26) | (47)
Marketable Securities, Equity, Fair Value | 909 | 3,156
Cash and Cash Equivalents | 481 | 2,929
Current Marketable Securities | 428 | 227
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 144,470 | 161,312
Marketable Securities, Debt, Unrealized Gains | 18 | 11
Marketable Securities, Debt, Unrealized Losses | (11,657) | (13,916)
Marketable Securities, Debt, Fair Value | 132,831 | 147,407
Cash and Cash Equivalents | 1,125 | 2,171
Current Marketable Securities | 31,162 | 24,431
Non-Current Marketable Securities | 100,544 | 120,805
Cash |  |
Marketable Securities [Line Items] |  |
Cash | 28,359 | 18,546
Cash and Cash Equivalents | 28,359 | 18,546
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 | 481 | 2,929
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 481 | 2,929
Cash and Cash Equivalents | 481 | 2,929
Current Marketable Securities | 0 | 0
Non-Current Marketable Securities | 0 | 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 |
Mutual funds | Level 1 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost |  | 274
Marketable Securities, Equity, Unrealized Gains |  | 0
Marketable Securities, Equity, Unrealized Losses |  | (47)
Marketable Securities, Equity, Fair Value |  | 227
Cash and Cash Equivalents |  | 0
Current Marketable Securities |  | 227
Non-Current Marketable Securities |  | 0
U.S. Treasury securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 19,406 | 25,134
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (1,292) | (1,725)
Marketable Securities, Debt, Fair Value | 18,114 | 23,409
Cash and Cash Equivalents | 35 | 338
Current Marketable Securities | 5,468 | 5,091
Non-Current Marketable Securities | 12,611 | 17,980
U.S. agency securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 5,736 | 5,823
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (600) | (655)
Marketable Securities, Debt, Fair Value | 5,136 | 5,168
Cash and Cash Equivalents | 36 | 0
Current Marketable Securities | 271 | 240
Non-Current Marketable Securities | 4,829 | 4,928
Non-U.S. government securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 17,533 | 16,948
Marketable Securities, Debt, Unrealized Gains | 6 | 2
Marketable Securities, Debt, Unrealized Losses | (1,048) | (1,201)
Marketable Securities, Debt, Fair Value | 16,491 | 15,749
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 11,332 | 8,806
Non-Current Marketable Securities | 5,159 | 6,943
Certificates of deposit and time deposits | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 1,354 | 2,067
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 1,354 | 2,067
Cash and Cash Equivalents | 1,034 | 1,805
Current Marketable Securities | 320 | 262
Non-Current Marketable Securities | 0 | 0
Commercial paper | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 608 | 718
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 608 | 718
Cash and Cash Equivalents | 0 | 28
Current Marketable Securities | 608 | 690
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 76,840 | 87,148
Marketable Securities, Debt, Unrealized Gains | 6 | 9
Marketable Securities, Debt, Unrealized Losses | (5,956) | (7,707)
Marketable Securities, Debt, Fair Value | 70,890 | 79,450
Cash and Cash Equivalents | 20 | 0
Current Marketable Securities | 12,627 | 9,023
Non-Current Marketable Securities | 58,243 | 70,427
Municipal securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 628 | 921
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | (26) | (35)
Marketable Securities, Debt, Fair Value | 602 | 886
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 192 | 266
Non-Current Marketable Securities | 410 | 620
Mortgage- and asset-backed securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 22,365 | 22,553
Marketable Securities, Debt, Unrealized Gains | 6 | 0
Marketable Securities, Debt, Unrealized Losses | (2,735) | (2,593)
Marketable Securities, Debt, Fair Value | 19,636 | 19,960
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 344 | 53
Non-Current Marketable Securities | $ 19,292 | $ 19,907

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