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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Dec. 26, 2020 | Sep. 26, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 192,582 | $ 189,431
Unrealized Gains | 3,130 | 2,784
Unrealized Losses | (141) | (385)
Fair Value | 195,571 | 191,830
Cash and Cash Equivalents | 36,010 | 38,016
Current Marketable Securities | 40,816 | 52,927
Non-Current Marketable Securities | 118,745 | 100,887
Total marketable securities that were restricted from general use | 19,500 | 18,600
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 167,541 | 169,487
Unrealized Gains | 3,130 | 2,784
Unrealized Losses | (141) | (385)
Fair Value | 170,530 | 171,886
Cash and Cash Equivalents | 10,969 | 18,072
Current Marketable Securities | 40,816 | 52,927
Non-Current Marketable Securities | 118,745 | 100,887
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 18,729 | 17,773
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 18,729 | 17,773
Cash and Cash Equivalents | 18,729 | 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] |  |
Adjusted Cost | 6,312 | 2,171
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 6,312 | 2,171
Cash and Cash Equivalents | 6,312 | 2,171
Current Marketable Securities | 0 | 0
Non-Current Marketable Securities | 0 | 0
U.S. Treasury securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 21,939 | 28,439
Unrealized Gains | 270 | 331
Unrealized Losses | (6) | 0
Fair Value | 22,203 | 28,770
Cash and Cash Equivalents | 3,227 | 8,580
Current Marketable Securities | 8,527 | 11,972
Non-Current Marketable Securities | 10,449 | 8,218
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 8,698 | 8,604
Unrealized Gains | 9 | 8
Unrealized Losses | (1) | 0
Fair Value | 8,706 | 8,612
Cash and Cash Equivalents | 1,000 | 2,009
Current Marketable Securities | 3,319 | 3,078
Non-Current Marketable Securities | 4,387 | 3,525
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 20,185 | 19,361
Unrealized Gains | 395 | 275
Unrealized Losses | (67) | (186)
Fair Value | 20,513 | 19,450
Cash and Cash Equivalents | 100 | 255
Current Marketable Securities | 2,874 | 3,329
Non-Current Marketable Securities | 17,539 | 15,866
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 8,002 | 10,399
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 8,002 | 10,399
Cash and Cash Equivalents | 5,009 | 4,043
Current Marketable Securities | 2,623 | 6,246
Non-Current Marketable Securities | 370 | 110
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 8,620 | 11,226
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 8,620 | 11,226
Cash and Cash Equivalents | 1,632 | 3,185
Current Marketable Securities | 6,988 | 8,041
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 83,042 | 76,937
Unrealized Gains | 2,155 | 1,834
Unrealized Losses | (44) | (175)
Fair Value | 85,153 | 78,596
Cash and Cash Equivalents | 1 | 0
Current Marketable Securities | 16,117 | 19,687
Non-Current Marketable Securities | 69,035 | 58,909
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 1,004 | 1,001
Unrealized Gains | 20 | 22
Unrealized Losses | 0 | 0
Fair Value | 1,024 | 1,023
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 94 | 139
Non-Current Marketable Securities | 930 | 884
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 16,051 | 13,520
Unrealized Gains | 281 | 314
Unrealized Losses | (23) | (24)
Fair Value | 16,309 | 13,810
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 274 | 435
Non-Current Marketable Securities | $ 16,035 | $ 13,375

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