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Income Taxes - Additional Information (Details) $ in Millions, € in Billions |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Aug. 30, 2016 EUR (€) Subsidiary | Sep. 26, 2020 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Sep. 26, 2020 EUR (€) | Sep. 30, 2017 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
U.S. statutory federal income tax rate | 21.00% | 35.00% |  | 21.00% | 21.00% | 24.50% |  |
Foreign pre-tax earnings |  |  |  | $ 38,100 | $ 44,300 | $ 48,000 |  |
Gross unrecognized tax benefits |  |  |  | 16,475 | 15,619 | 9,694 |  | $ 8,407
Gross unrecognized tax benefits that would impact effective tax rate, if recognized |  |  |  | 8,800 | 8,600 |  |  |
Reasonably possible decrease in gross unrecognized tax benefits over next 12 months |  |  |  | 3,900 |  |  |  |
Gross interest and penalties accrued |  |  |  | 1,400 | 1,300 |  |  |
Interest and penalty expense |  |  |  | $ 85 | $ 73 | $ 489 |  |
Unfavorable investigation outcome, EU State Aid rules |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Number of subsidiaries impacted by the European Commission tax ruling | Subsidiary |  |  | 2 |  |  |  |  |
Maximum potential loss related to European Commission tax ruling | € |  |  | € 13.1 |  |  |  | € 12.9 |
Unfavorable investigation outcome, EU State Aid rules - interest component |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Maximum potential loss related to European Commission tax ruling | € |  |  | € 1.2 |  |  |  |  |

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