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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Dec. 25, 2021 | Sep. 25, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 203,819 | $ 189,961
Cash Equivalents and Marketable Securities, Unrealized Gains | 1,071 | 1,753
Cash Equivalents and Marketable Securities, Unrealized Losses | 2,294 | 1,198
Cash, Cash Equivalents and Marketable Securities, Fair Value | 202,596 | 190,516
Cash and Cash Equivalents | 37,119 | 34,940
Current Marketable Securities | 26,794 | 27,699
Non-Current Marketable Securities | 138,683 | 127,877
Total marketable securities that were restricted from general use | 16,800 | 17,900
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 11,571 | 9,783
Marketable Securities, Equity, Unrealized Gains | 16 | 11
Marketable Securities, Equity, Unrealized Losses | (2) | (1)
Marketable Securities, Equity, Fair Value | 11,585 | 9,793
Cash and Cash Equivalents | 11,356 | 9,608
Current Marketable Securities | 229 | 185
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 174,256 | 162,873
Marketable Securities, Debt, Unrealized Gains | 1,055 | 1,742
Marketable Securities, Debt, Unrealized Losses | (2,292) | (1,197)
Marketable Securities, Debt, Fair Value | 173,019 | 163,418
Cash and Cash Equivalents | 7,771 | 8,027
Current Marketable Securities | 26,565 | 27,514
Non-Current Marketable Securities | 138,683 | 127,877
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash | 17,992 | 17,305
Cash and Cash Equivalents | 17,992 | 17,305
Current Marketable Securities | 0 | 0
Non-Current Marketable Securities | 0 | 0
Money market funds | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 11,356 | 9,608
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 11,356 | 9,608
Cash and Cash Equivalents | 11,356 | 9,608
Current Marketable Securities | 0 | 0
Non-Current Marketable Securities | 0 | 0
Mutual funds | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 215 | 175
Marketable Securities, Equity, Unrealized Gains | 16 | 11
Marketable Securities, Equity, Unrealized Losses | (2) | (1)
Marketable Securities, Equity, Fair Value | 229 | 185
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 229 | 185
Non-Current Marketable Securities | 0 | 0
Equity securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 1,527 | 1,527
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | (850) | (564)
Marketable Securities, Equity, Fair Value | 677 | 963
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 677 | 963
Non-Current Marketable Securities | 0 | 0
U.S. Treasury securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 29,221 | 22,878
Marketable Securities, Debt, Unrealized Gains | 64 | 102
Marketable Securities, Debt, Unrealized Losses | (171) | (77)
Marketable Securities, Debt, Fair Value | 29,114 | 22,903
Cash and Cash Equivalents | 3,247 | 3,596
Current Marketable Securities | 5,775 | 6,625
Non-Current Marketable Securities | 20,092 | 12,682
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 7,934 | 8,949
Marketable Securities, Debt, Unrealized Gains | 1 | 2
Marketable Securities, Debt, Unrealized Losses | (116) | (64)
Marketable Securities, Debt, Fair Value | 7,819 | 8,887
Cash and Cash Equivalents | 1,066 | 1,775
Current Marketable Securities | 1,581 | 1,930
Non-Current Marketable Securities | 5,172 | 5,182
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 18,983 | 20,201
Marketable Securities, Debt, Unrealized Gains | 160 | 211
Marketable Securities, Debt, Unrealized Losses | (177) | (101)
Marketable Securities, Debt, Fair Value | 18,966 | 20,311
Cash and Cash Equivalents | 200 | 390
Current Marketable Securities | 3,279 | 3,091
Non-Current Marketable Securities | 15,487 | 16,830
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 3,648 | 1,300
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 3,648 | 1,300
Cash and Cash Equivalents | 2,527 | 490
Current Marketable Securities | 1,121 | 810
Non-Current Marketable Securities | 0 | 0
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 2,261 | 2,639
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 2,261 | 2,639
Cash and Cash Equivalents | 702 | 1,776
Current Marketable Securities | 1,559 | 863
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 88,617 | 83,883
Marketable Securities, Debt, Unrealized Gains | 718 | 1,242
Marketable Securities, Debt, Unrealized Losses | (754) | (267)
Marketable Securities, Debt, Fair Value | 88,581 | 84,858
Cash and Cash Equivalents | 29 | 0
Current Marketable Securities | 11,665 | 12,327
Non-Current Marketable Securities | 76,887 | 72,531
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 993 | 967
Marketable Securities, Debt, Unrealized Gains | 10 | 14
Marketable Securities, Debt, Unrealized Losses | (1) | 0
Marketable Securities, Debt, Fair Value | 1,002 | 981
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 150 | 130
Non-Current Marketable Securities | 852 | 851
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 21,072 | 20,529
Marketable Securities, Debt, Unrealized Gains | 102 | 171
Marketable Securities, Debt, Unrealized Losses | (223) | (124)
Marketable Securities, Debt, Fair Value | 20,951 | 20,576
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 758 | 775
Non-Current Marketable Securities | $ 20,193 | $ 19,801

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