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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 27, 2020 | Sep. 28, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 191,519 | $ 204,977
Unrealized Gains | 2,672 | 1,202
Unrealized Losses | (574) | (281)
Fair Value | 193,617 | 205,898
Cash and Cash Equivalents | 33,383 | 48,844
Current Marketable Securities | 59,642 | 51,713
Non-Current Marketable Securities | 100,592 | 105,341
Total cash, cash equivalents and marketable securities that were restricted from general use | 18,300 | 18,900
Marketable securities pledged as collateral under repurchase agreements | 5,300 |
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 7,013 | 15,897
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 7,013 | 15,897
Cash and Cash Equivalents | 7,013 | 15,897
Current Marketable Securities | 0 | 0
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 164,253 | 176,876
Unrealized Gains | 2,672 | 1,202
Unrealized Losses | (574) | (281)
Fair Value | 166,351 | 177,797
Cash and Cash Equivalents | 6,117 | 20,743
Current Marketable Securities | 59,642 | 51,713
Non-Current Marketable Securities | 100,592 | 105,341
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 20,253 | 12,204
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 20,253 | 12,204
Cash and Cash Equivalents | 20,253 | 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 | 7,013 | 15,897
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 7,013 | 15,897
Cash and Cash Equivalents | 7,013 | 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 | 23,207 | 30,293
Unrealized Gains | 394 | 33
Unrealized Losses | 0 | (62)
Fair Value | 23,601 | 30,264
Cash and Cash Equivalents | 1,767 | 6,165
Current Marketable Securities | 11,346 | 9,817
Non-Current Marketable Securities | 10,488 | 14,282
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 7,129 | 9,767
Unrealized Gains | 9 | 1
Unrealized Losses | (2) | (3)
Fair Value | 7,136 | 9,765
Cash and Cash Equivalents | 59 | 6,489
Current Marketable Securities | 2,737 | 2,249
Non-Current Marketable Securities | 4,340 | 1,027
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 19,324 | 19,821
Unrealized Gains | 255 | 337
Unrealized Losses | (272) | (50)
Fair Value | 19,307 | 20,108
Cash and Cash Equivalents | 1 | 749
Current Marketable Securities | 4,062 | 3,168
Non-Current Marketable Securities | 15,244 | 16,191
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 10,247 | 4,041
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 10,247 | 4,041
Cash and Cash Equivalents | 3,324 | 2,024
Current Marketable Securities | 6,787 | 1,922
Non-Current Marketable Securities | 136 | 95
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 12,105 | 12,433
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 12,105 | 12,433
Cash and Cash Equivalents | 936 | 5,193
Current Marketable Securities | 11,169 | 7,240
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 78,747 | 85,383
Unrealized Gains | 1,672 | 756
Unrealized Losses | (280) | (92)
Fair Value | 80,139 | 86,047
Cash and Cash Equivalents | 30 | 123
Current Marketable Securities | 22,581 | 26,127
Non-Current Marketable Securities | 57,528 | 59,797
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 964 | 958
Unrealized Gains | 20 | 8
Unrealized Losses | 0 | (1)
Fair Value | 984 | 965
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 43 | 68
Non-Current Marketable Securities | 941 | 897
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 12,530 | 14,180
Unrealized Gains | 322 | 67
Unrealized Losses | (20) | (73)
Fair Value | 12,832 | 14,174
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 917 | 1,122
Non-Current Marketable Securities | $ 11,915 | $ 13,052

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