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Divestiture - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 28, 2019
Mar. 28, 2020
Sep. 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