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Divestiures, West Africa Investments and Acquisitions Divestiture (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 28, 2019
Dec. 28, 2019
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from divestiture of businesses     $ 1,332 $ 0 $ 0
Debt repurchase amount   $ 1,000 1,000    
Income taxes paid   $ 255 $ 537 $ 188 $ 352
Transition Services Agreement duration     18 months    
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]          
Proceeds from divestiture of businesses $ 1,300        
Net assets $ 1,300        
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