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Summary of Significant Accounting Policies - Additional Information (Details) shares in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 28, 2020 | Sep. 26, 2020 USD ($) | Sep. 28, 2019 USD ($) shares | Sep. 29, 2018 USD ($) | Sep. 29, 2019 USD ($) | Sep. 30, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Common stock split ratio | 4 |  |  |  |  |
Right-of-use assets recorded upon adoption of new leases standard |  | $ 9,199 |  |  |  |
Lease liabilities recorded upon adoption of new leases standard |  | 9,842 |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  | 65,339 | $ 90,488 | $ 107,147 |  | $ 134,047
Potentially dilutive securities excluded from the computation of diluted earnings per share because their effect would have been antidilutive (in shares) | shares |  |  | 62 |  |  |
Depreciation and amortization expense on property and equipment |  | $ 9,700 | $ 11,300 | 9,300 |  |
Non-cash investing activities involving property, plant and equipment, net increase/(decrease) to accounts payable and other current liabilities |  |  | (2,900) | 3,400 |  |
Building | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 40 years |  |  |  |
Machinery and Equipment | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 1 year |  |  |  |
Machinery and Equipment | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 5 years |  |  |  |
Internal-Use Software | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 3 years |  |  |  |
Internal-Use Software | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  | 7 years |  |  |  |
Accumulated other comprehensive income/(loss) |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  | $ (406) | (584) | (3,454) |  | (150)
Accumulated other comprehensive income/(loss) | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  |  | 136 | 89 |  | (278)
Retained earnings |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  | $ 14,966 | 45,898 | 70,400 |  | 98,330
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  |  | (136) | $ 2,501 |  | $ 278
Accounting Standards Update 2016-02 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Right-of-use assets recorded upon adoption of new leases standard |  |  |  |  | $ 7,500 |
Lease liabilities recorded upon adoption of new leases standard |  |  |  |  | $ 8,100 |
Accounting Standards Update 2017-12 | Accumulated other comprehensive income/(loss) | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  |  | 136 |  |  |
Accounting Standards Update 2017-12 | Retained earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  |  | $ (136) |  |  |

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