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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Dec. 28, 2019 | Sep. 28, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 205,990 | $ 204,977
Unrealized Gains | 1,310 | 1,202
Unrealized Losses | (239) | (281)
Fair Value | 207,061 | 205,898
Cash and Cash Equivalents | 39,771 | 48,844
Current Marketable Securities | 67,391 | 51,713
Non-Current Marketable Securities | 99,899 | 105,341
Total cash, cash equivalents and marketable securities that were restricted from general use | 19,100 | 18,900
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 11,535 | 15,897
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 11,535 | 15,897
Cash and Cash Equivalents | 11,535 | 15,897
Current Marketable Securities | 0 | 0
Non-Current Marketable Securities | 0 | 0
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 183,072 | 176,876
Unrealized Gains | 1,310 | 1,202
Unrealized Losses | (239) | (281)
Fair Value | 184,143 | 177,797
Cash and Cash Equivalents | 16,853 | 20,743
Current Marketable Securities | 67,391 | 51,713
Non-Current Marketable Securities | 99,899 | 105,341
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 11,383 | 12,204
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 11,383 | 12,204
Cash and Cash Equivalents | 11,383 | 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 | 11,535 | 15,897
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 11,535 | 15,897
Cash and Cash Equivalents | 11,535 | 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 | 28,600 | 30,293
Unrealized Gains | 29 | 33
Unrealized Losses | (40) | (62)
Fair Value | 28,589 | 30,264
Cash and Cash Equivalents | 3,950 | 6,165
Current Marketable Securities | 11,069 | 9,817
Non-Current Marketable Securities | 13,570 | 14,282
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 8,302 | 9,767
Unrealized Gains | 2 | 1
Unrealized Losses | (1) | (3)
Fair Value | 8,303 | 9,765
Cash and Cash Equivalents | 3,703 | 6,489
Current Marketable Securities | 4,095 | 2,249
Non-Current Marketable Securities | 505 | 1,027
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 18,978 | 19,821
Unrealized Gains | 324 | 337
Unrealized Losses | (92) | (50)
Fair Value | 19,210 | 20,108
Cash and Cash Equivalents | 289 | 749
Current Marketable Securities | 2,637 | 3,168
Non-Current Marketable Securities | 16,284 | 16,191
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 12,916 | 4,041
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 12,916 | 4,041
Cash and Cash Equivalents | 4,595 | 2,024
Current Marketable Securities | 6,777 | 1,922
Non-Current Marketable Securities | 1,544 | 95
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 17,823 | 12,433
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 17,823 | 12,433
Cash and Cash Equivalents | 4,254 | 5,193
Current Marketable Securities | 13,569 | 7,240
Non-Current Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 82,007 | 85,383
Unrealized Gains | 876 | 756
Unrealized Losses | (37) | (92)
Fair Value | 82,846 | 86,047
Cash and Cash Equivalents | 62 | 123
Current Marketable Securities | 27,894 | 26,127
Non-Current Marketable Securities | 54,890 | 59,797
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 971 | 958
Unrealized Gains | 11 | 8
Unrealized Losses | 0 | (1)
Fair Value | 982 | 965
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 35 | 68
Non-Current Marketable Securities | 947 | 897
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 13,475 | 14,180
Unrealized Gains | 68 | 67
Unrealized Losses | (69) | (73)
Fair Value | 13,474 | 14,174
Cash and Cash Equivalents | 0 | 0
Current Marketable Securities | 1,315 | 1,122
Non-Current Marketable Securities | $ 12,159 | $ 13,052

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