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Divestiture - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash proceeds from sale of businesses       $ 0 $ 1,332
Debt repurchase amount     $ 1,000   $ 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