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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Sep. 26, 2020 | Sep. 28, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 189,431 | $ 204,977
Unrealized Gains | 2,784 | 1,202
Unrealized Losses | (385) | (281)
Fair Value | 191,830 | 205,898
Cash and Cash Equivalents | 38,016 | 48,844
Current Marketable Securities | 52,927 | 51,713
Non-Current Marketable Securities | 100,887 | 105,341
Total marketable securities that were restricted from general use | 18,600 | 18,900
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 2,171 | 15,897
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 2,171 | 15,897
Cash and Cash Equivalents | 2,171 | 15,897
Current Marketable Securities | 0 | 0
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 169,487 | 176,876
Unrealized Gains | 2,784 | 1,202
Unrealized Losses | (385) | (281)
Fair Value | 171,886 | 177,797
Cash and Cash Equivalents | 18,072 | 20,743
Current Marketable Securities | 52,927 | 51,713
Non-Current Marketable Securities | 100,887 | 105,341
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 17,773 | 12,204
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 17,773 | 12,204
Cash and Cash Equivalents | 17,773 | 12,204
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 | 2,171 | 15,897
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 2,171 | 15,897
Cash and Cash Equivalents | 2,171 | 15,897
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 | 28,439 | 30,293
Unrealized Gains | 331 | 33
Unrealized Losses | 0 | (62)
Fair Value | 28,770 | 30,264
Cash and Cash Equivalents | 8,580 | 6,165
Current Marketable Securities | 11,972 | 9,817
Non-Current Marketable Securities | 8,218 | 14,282
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 8,604 | 9,767
Unrealized Gains | 8 | 1
Unrealized Losses | 0 | (3)
Fair Value | 8,612 | 9,765
Cash and Cash Equivalents | 2,009 | 6,489
Current Marketable Securities | 3,078 | 2,249
Non-Current Marketable Securities | 3,525 | 1,027
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 19,361 | 19,821
Unrealized Gains | 275 | 337
Unrealized Losses | (186) | (50)
Fair Value | 19,450 | 20,108
Cash and Cash Equivalents | 255 | 749
Current Marketable Securities | 3,329 | 3,168
Non-Current Marketable Securities | 15,866 | 16,191
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 10,399 | 4,041
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 10,399 | 4,041
Cash and Cash Equivalents | 4,043 | 2,024
Current Marketable Securities | 6,246 | 1,922
Non-Current Marketable Securities | 110 | 95
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 11,226 | 12,433
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 11,226 | 12,433
Cash and Cash Equivalents | 3,185 | 5,193
Current Marketable Securities | 8,041 | 7,240
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 76,937 | 85,383
Unrealized Gains | 1,834 | 756
Unrealized Losses | (175) | (92)
Fair Value | 78,596 | 86,047
Cash and Cash Equivalents | 0 | 123
Current Marketable Securities | 19,687 | 26,127
Non-Current Marketable Securities | 58,909 | 59,797
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 1,001 | 958
Unrealized Gains | 22 | 8
Unrealized Losses | 0 | (1)
Fair Value | 1,023 | 965
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 139 | 68
Non-Current Marketable Securities | 884 | 897
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 13,520 | 14,180
Unrealized Gains | 314 | 67
Unrealized Losses | (24) | (73)
Fair Value | 13,810 | 14,174
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 435 | 1,122
Non-Current Marketable Securities | $ 13,375 | $ 13,052

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