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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Sep. 25, 2016
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase to net deferred tax assets upon adoption of ASU 2016-16 | $ 8,045 | $ 5,834 |  |  |  |
Reduction to other non-current assets upon adoption of ASU 2016-16 | $ (32,978) | (22,283) |  |  |  |
Potentially dilutive securities excluded from the computation of diluted earnings per share because their effect would have been antidilutive (in shares) | 15.5 |  |  |  |  |
Depreciation and amortization expense on property and equipment | $ 11,300 | 9,300 | $ 8,200 |  |  |
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 | 30 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 | 5 years |  |  |  |  |
Retained earnings |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase to retained earnings upon adoption of ASU 2016-16 |  |  |  | $ 2,501 | $ 278 | $ 0
Accounting Standards Update 2016-16 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase to net deferred tax assets upon adoption of ASU 2016-16 |  |  |  | 2,700 |  |
Reduction to other non-current assets upon adoption of ASU 2016-16 |  |  |  | 128 |  |
Accounting Standards Update 2016-16 | Retained earnings |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase to retained earnings upon adoption of ASU 2016-16 |  |  |  | $ 2,600 |  |

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