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Divestiture - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Jul. 28, 2019 | Jun. 27, 2020 | Dec. 28, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Debt repurchase amount |  |  | $ 1,000
Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Cash proceeds from sale of businesses | $ 1,300 |  |
Net assets | $ 1,300 |  |
Transition Services Agreement Time Frame |  | 18 months |
Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses | Other income (expense) |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain (Loss) on Disposition of Business |  |  | 38
Disposition related transaction costs |  |  | 14
U.S. pension and nonpension postretirement plans | Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Curtailment gain |  |  | $ 17

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