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Sale of Accounts Receivable (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Dec. 28, 2019
Monetization Program | Other Income (Expense), Net      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Gain (Loss) on Sale of Accounts Receivable $ (8) $ (14) $ (25)
Monetization Program | Maximum      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfers Of Accounts Receivable Agreements 1,100    
Monetization Program | Sold And Outstanding      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfer of Accounts Receivable Agreements 549 783  
Kellogg Foreign Subsidiaries Program | Sold And Outstanding      
Transfer of Financial Assets Accounted for as Sales [Line Items]      
Transfer of Accounts Receivable Agreements $ 66 $ 55