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SALE OF ACCOUNTS RECEIVABLE - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Jun. 29, 2024
Jul. 01, 2023
Dec. 30, 2023
Monetization Program | Other income (expense)          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Gain (Loss) on Sale of Accounts Receivable $ (11) $ (11) $ (22) $ (19)  
Monetization Program | Maximum [Member]          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfers of Accounts Receivable Agreements 975   975    
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 765   765   $ 697
Kellogg Foreign Subsidiaries Other Program          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfers of Accounts Receivable Agreements $ 19   $ 19   $ 8