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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Mar. 26, 2022 | Sep. 25, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | $ 201,293 | $ 189,961
Cash Equivalents and Marketable Securities, Unrealized Gains | 151 | 1,753
Cash Equivalents and Marketable Securities, Unrealized Losses | (8,714) | (1,198)
Cash, Cash Equivalents and Marketable Securities, Fair Value | 192,730 | 190,516
Cash and Cash Equivalents | 28,098 | 34,940
Current Marketable Securities | 23,413 | 27,699
Non-Current Marketable Securities | 141,219 | 127,877
Total marketable securities that were restricted from general use | 15,400 | 17,900
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 7,883 | 9,783
Marketable Securities, Equity, Unrealized Gains | 7 | 11
Marketable Securities, Equity, Unrealized Losses | (9) | (1)
Marketable Securities, Equity, Fair Value | 7,881 | 9,793
Cash and Cash Equivalents | 7,653 | 9,608
Current Marketable Securities | 228 | 185
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 179,112 | 162,873
Marketable Securities, Debt, Unrealized Gains | 144 | 1,742
Marketable Securities, Debt, Unrealized Losses | (8,705) | (1,197)
Marketable Securities, Debt, Fair Value | 170,551 | 163,418
Cash and Cash Equivalents | 6,147 | 8,027
Current Marketable Securities | 23,185 | 27,514
Non-Current Marketable Securities | 141,219 | 127,877
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash | 14,298 | 17,305
Cash and Cash Equivalents | 14,298 | 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 | 7,653 | 9,608
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 7,653 | 9,608
Cash and Cash Equivalents | 7,653 | 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 | 230 | 175
Marketable Securities, Equity, Unrealized Gains | 7 | 11
Marketable Securities, Equity, Unrealized Losses | (9) | (1)
Marketable Securities, Equity, Fair Value | 228 | 185
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 228 | 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 | (1,132) | (564)
Marketable Securities, Equity, Fair Value | 395 | 963
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 395 | 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 | 28,711 | 22,878
Marketable Securities, Debt, Unrealized Gains | 2 | 102
Marketable Securities, Debt, Unrealized Losses | (1,037) | (77)
Marketable Securities, Debt, Fair Value | 27,676 | 22,903
Cash and Cash Equivalents | 2,306 | 3,596
Current Marketable Securities | 3,554 | 6,625
Non-Current Marketable Securities | 21,816 | 12,682
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 6,561 | 8,949
Marketable Securities, Debt, Unrealized Gains | 0 | 2
Marketable Securities, Debt, Unrealized Losses | (407) | (64)
Marketable Securities, Debt, Fair Value | 6,154 | 8,887
Cash and Cash Equivalents | 251 | 1,775
Current Marketable Securities | 683 | 1,930
Non-Current Marketable Securities | 5,220 | 5,182
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 18,868 | 20,201
Marketable Securities, Debt, Unrealized Gains | 44 | 211
Marketable Securities, Debt, Unrealized Losses | (551) | (101)
Marketable Securities, Debt, Fair Value | 18,361 | 20,311
Cash and Cash Equivalents | 25 | 390
Current Marketable Securities | 4,526 | 3,091
Non-Current Marketable Securities | 13,810 | 16,830
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 2,872 | 1,300
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 2,872 | 1,300
Cash and Cash Equivalents | 2,221 | 490
Current Marketable Securities | 601 | 810
Non-Current Marketable Securities | 50 | 0
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 2,913 | 2,639
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 2,913 | 2,639
Cash and Cash Equivalents | 1,310 | 1,776
Current Marketable Securities | 1,603 | 863
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 93,057 | 83,883
Marketable Securities, Debt, Unrealized Gains | 94 | 1,242
Marketable Securities, Debt, Unrealized Losses | (4,266) | (267)
Marketable Securities, Debt, Fair Value | 88,885 | 84,858
Cash and Cash Equivalents | 34 | 0
Current Marketable Securities | 11,309 | 12,327
Non-Current Marketable Securities | 77,542 | 72,531
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 990 | 967
Marketable Securities, Debt, Unrealized Gains | 1 | 14
Marketable Securities, Debt, Unrealized Losses | (22) | 0
Marketable Securities, Debt, Fair Value | 969 | 981
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 162 | 130
Non-Current Marketable Securities | 807 | 851
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 23,613 | 20,529
Marketable Securities, Debt, Unrealized Gains | 3 | 171
Marketable Securities, Debt, Unrealized Losses | (1,290) | (124)
Marketable Securities, Debt, Fair Value | 22,326 | 20,576
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 352 | 775
Non-Current Marketable Securities | $ 21,974 | $ 19,801

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