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Sale of Accounts Receivable - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 01, 2023
Apr. 02, 2022
Dec. 31, 2022
Monetization Program | Other income (expense)      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Gain (Loss) on Sale of Accounts Receivable $ (12) $ (2)  
Monetization Program | Maximum [Member]      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfers of Accounts Receivable Agreements 945   $ 920
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 911   865
Kellogg Foreign Subsidiaries Other Program      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfers of Accounts Receivable Agreements $ 28   $ 31