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Sale of Accounts Receivable - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Dec. 28, 2019
Monetization Program | Other income (expense)          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Gain (Loss) on Sale of Accounts Receivable $ (3) $ (6) $ (11) $ (21)  
Monetization Program | Maximum [Member]          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfers of Accounts Receivable Agreements 1,033   1,033    
Monetization Program | Sold And Outstanding          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized 929   929   $ 774
Kellogg Foreign Subsidiaries Other Program          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfers of Accounts Receivable Agreements $ 22   $ 22   $ 89