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SALE OF ACCOUNTS RECEIVABLE - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Dec. 28, 2024
Monetization Program | Other income (expense)      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Gain (Loss) on Sale of Accounts Receivable $ (10) $ (11)  
Monetization Program | Maximum [Member]      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfers of Accounts Receivable Agreements 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 729   $ 653
Kellogg Foreign Subsidiaries Other Program      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfers of Accounts Receivable Agreements $ 5   $ 15