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Sale of Accounts Receivable - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Jan. 02, 2021
Monetization Program | Other income (expense)      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Gain (Loss) on Sale of Accounts Receivable $ (2) $ (6)  
Monetization Program | Maximum [Member]      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfers of Accounts Receivable Agreements 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 785   $ 783
Kellogg Foreign Subsidiaries Other Program      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfers of Accounts Receivable Agreements $ 16   $ 55