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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 28, 2019 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate |  | 27.00% | 15.00% | 22.00% | 14.00% |
Income tax benefit related to transition tax liability |  | $ 16 |  |  |  |
Discrete tax benefit |  |  |  |  | $ 44 |
Accrued income taxes |  | 294 |  | $ 294 |  | $ 48
Income taxes paid | $ 260 |  |  | 211 | $ 163 |
Unrecognized tax benefits |  | 86 |  | 86 |  | $ 97
Unrecognized tax benefits that would affect the effective income tax rate |  | 78 |  | 78 |  |
Other current liabilities |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits |  | 19 |  | 19 |  |
Projected additions to unrecognized tax benefits |  | 2 |  | 2 |  |
Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Accrued income taxes |  | 60 |  | 60 |  |
Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses | Deferred tax liability |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Accrued income taxes |  | $ 200 |  | $ 200 |  |

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