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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 26, 2021 | Sep. 26, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Cash and Cash Equivalents | $ 34,050 | $ 38,016
Current Marketable Securities | 27,646 | 52,927
Non-Current Marketable Securities | 131,948 | 100,887
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | 192,304 | 189,431
Cash Equivalents and Marketable Securities, Unrealized Gains | 2,046 | 2,784
Cash Equivalents and Marketable Securities, Unrealized Losses | 706 | 385
Cash, Cash Equivalents and Marketable Securities, Fair Value | 193,644 | 191,830
Total marketable securities that were restricted from general use | 18,900 | 18,600
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 9,727 |
Marketable Securities, Equity, Unrealized Gains | 8 |
Marketable Securities, Equity, Unrealized Losses | 0 |
Marketable Securities, Equity, Fair Value | 9,735 |
Cash and Cash Equivalents | 9,568 |
Current Marketable Securities | 167 |
Non-Current Marketable Securities | 0 |
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 167,724 | 169,487
Marketable Securities, Debt, Unrealized Gains | 2,038 | 2,784
Marketable Securities, Debt, Unrealized Losses | (706) | (385)
Marketable Securities, Debt, Fair Value | 169,056 | 171,886
Cash and Cash Equivalents | 9,629 | 18,072
Current Marketable Securities | 27,479 | 52,927
Non-Current Marketable Securities | 131,948 | 100,887
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash | 14,853 | 17,773
Cash and Cash Equivalents | 14,853 | 17,773
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 | 9,568 | 2,171
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 9,568 | 2,171
Cash and Cash Equivalents | 9,568 | 2,171
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 | 159 |
Marketable Securities, Equity, Unrealized Gains | 8 |
Marketable Securities, Equity, Unrealized Losses | 0 |
Marketable Securities, Equity, Fair Value | 167 |
Cash and Cash Equivalents | 0 |
Current Marketable Securities | 167 |
Non-Current Marketable Securities | 0 |
U.S. Treasury securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 22,582 | 28,439
Marketable Securities, Debt, Unrealized Gains | 133 | 331
Marketable Securities, Debt, Unrealized Losses | (112) | 0
Marketable Securities, Debt, Fair Value | 22,603 | 28,770
Cash and Cash Equivalents | 1,602 | 8,580
Current Marketable Securities | 8,083 | 11,972
Non-Current Marketable Securities | 12,918 | 8,218
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 7,542 | 8,604
Marketable Securities, Debt, Unrealized Gains | 3 | 8
Marketable Securities, Debt, Unrealized Losses | (69) | 0
Marketable Securities, Debt, Fair Value | 7,476 | 8,612
Cash and Cash Equivalents | 410 | 2,009
Current Marketable Securities | 1,781 | 3,078
Non-Current Marketable Securities | 5,285 | 3,525
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 20,007 | 19,361
Marketable Securities, Debt, Unrealized Gains | 252 | 275
Marketable Securities, Debt, Unrealized Losses | (92) | (186)
Marketable Securities, Debt, Fair Value | 20,167 | 19,450
Cash and Cash Equivalents | 118 | 255
Current Marketable Securities | 3,537 | 3,329
Non-Current Marketable Securities | 16,512 | 15,866
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 7,099 | 10,399
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 7,099 | 10,399
Cash and Cash Equivalents | 6,362 | 4,043
Current Marketable Securities | 466 | 6,246
Non-Current Marketable Securities | 271 | 110
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 2,056 | 11,226
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 2,056 | 11,226
Cash and Cash Equivalents | 1,137 | 3,185
Current Marketable Securities | 919 | 8,041
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 85,221 | 76,937
Marketable Securities, Debt, Unrealized Gains | 1,444 | 1,834
Marketable Securities, Debt, Unrealized Losses | (276) | (175)
Marketable Securities, Debt, Fair Value | 86,389 | 78,596
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 11,903 | 19,687
Non-Current Marketable Securities | 74,486 | 58,909
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 984 | 1,001
Marketable Securities, Debt, Unrealized Gains | 15 | 22
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 999 | 1,023
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 128 | 139
Non-Current Marketable Securities | 871 | 884
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 22,233 | 13,520
Marketable Securities, Debt, Unrealized Gains | 191 | 314
Marketable Securities, Debt, Unrealized Losses | (157) | (24)
Marketable Securities, Debt, Fair Value | 22,267 | 13,810
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 662 | 435
Non-Current Marketable Securities | $ 21,605 | $ 13,375

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