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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Mar. 27, 2021 | Sep. 26, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash and Cash Equivalents | $ 38,466 | $ 38,016
Current Marketable Securities | 31,368 | 52,927
Non-Current Marketable Securities | 134,539 | 100,887
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost | 203,256 | 189,431
Cash Equivalents and Marketable Securities, Unrealized Gains | 2,141 | 2,784
Cash Equivalents and Marketable Securities, Unrealized Losses | 1,024 | 385
Cash, Cash Equivalents and Marketable Securities, Fair Value | 204,373 | 191,830
Total marketable securities that were restricted from general use | 19,000 | 18,600
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Equity, Adjusted Cost | 12,141 |
Marketable Securities, Equity, Unrealized Gains | 1 |
Marketable Securities, Equity, Unrealized Losses | (2) |
Marketable Securities, Equity, Fair Value | 12,140 |
Cash and Cash Equivalents | 11,998 |
Current Marketable Securities | 142 |
Non-Current Marketable Securities | 0 |
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 171,671 | 169,487
Marketable Securities, Debt, Unrealized Gains | 2,140 | 2,784
Marketable Securities, Debt, Unrealized Losses | (1,022) | (385)
Marketable Securities, Debt, Fair Value | 172,789 | 171,886
Cash and Cash Equivalents | 7,024 | 18,072
Current Marketable Securities | 31,226 | 52,927
Non-Current Marketable Securities | 134,539 | 100,887
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash | 19,444 | 17,773
Cash and Cash Equivalents | 19,444 | 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 | 11,998 | 2,171
Marketable Securities, Equity, Unrealized Gains | 0 | 0
Marketable Securities, Equity, Unrealized Losses | 0 | 0
Marketable Securities, Equity, Fair Value | 11,998 | 2,171
Cash and Cash Equivalents | 11,998 | 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 | 143 |
Marketable Securities, Equity, Unrealized Gains | 1 |
Marketable Securities, Equity, Unrealized Losses | (2) |
Marketable Securities, Equity, Fair Value | 142 |
Cash and Cash Equivalents | 0 |
Current Marketable Securities | 142 |
Non-Current Marketable Securities | 0 |
U.S. Treasury securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 21,331 | 28,439
Marketable Securities, Debt, Unrealized Gains | 168 | 331
Marketable Securities, Debt, Unrealized Losses | (149) | 0
Marketable Securities, Debt, Fair Value | 21,350 | 28,770
Cash and Cash Equivalents | 205 | 8,580
Current Marketable Securities | 8,058 | 11,972
Non-Current Marketable Securities | 13,087 | 8,218
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 8,228 | 8,604
Marketable Securities, Debt, Unrealized Gains | 5 | 8
Marketable Securities, Debt, Unrealized Losses | (72) | 0
Marketable Securities, Debt, Fair Value | 8,161 | 8,612
Cash and Cash Equivalents | 0 | 2,009
Current Marketable Securities | 3,212 | 3,078
Non-Current Marketable Securities | 4,949 | 3,525
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 19,849 | 19,361
Marketable Securities, Debt, Unrealized Gains | 211 | 275
Marketable Securities, Debt, Unrealized Losses | (169) | (186)
Marketable Securities, Debt, Fair Value | 19,891 | 19,450
Cash and Cash Equivalents | 200 | 255
Current Marketable Securities | 2,881 | 3,329
Non-Current Marketable Securities | 16,810 | 15,866
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 7,198 | 10,399
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 7,198 | 10,399
Cash and Cash Equivalents | 5,814 | 4,043
Current Marketable Securities | 1,114 | 6,246
Non-Current Marketable Securities | 270 | 110
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 3,353 | 11,226
Marketable Securities, Debt, Unrealized Gains | 0 | 0
Marketable Securities, Debt, Unrealized Losses | 0 | 0
Marketable Securities, Debt, Fair Value | 3,353 | 11,226
Cash and Cash Equivalents | 805 | 3,185
Current Marketable Securities | 2,548 | 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 | 88,108 | 76,937
Marketable Securities, Debt, Unrealized Gains | 1,506 | 1,834
Marketable Securities, Debt, Unrealized Losses | (444) | (175)
Marketable Securities, Debt, Fair Value | 89,170 | 78,596
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 13,036 | 19,687
Non-Current Marketable Securities | 76,134 | 58,909
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 980 | 1,001
Marketable Securities, Debt, Unrealized Gains | 16 | 22
Marketable Securities, Debt, Unrealized Losses | (1) | 0
Marketable Securities, Debt, Fair Value | 995 | 1,023
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 136 | 139
Non-Current Marketable Securities | 859 | 884
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable Securities, Debt, Adjusted Cost | 22,624 | 13,520
Marketable Securities, Debt, Unrealized Gains | 234 | 314
Marketable Securities, Debt, Unrealized Losses | (187) | (24)
Marketable Securities, Debt, Fair Value | 22,671 | 13,810
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 241 | 435
Non-Current Marketable Securities | $ 22,430 | $ 13,375

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