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Sale of Accounts Receivable - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2022
Oct. 02, 2021
Oct. 01, 2022
Oct. 02, 2021
Jan. 01, 2022
Monetization Program | Other income (expense)          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Gain (Loss) on Sale of Accounts Receivable $ (6) $ (2) $ (11) $ (6)  
Monetization Program | Maximum [Member]          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfers of Accounts Receivable Agreements 745   745   $ 1,100
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 632   632   549
Kellogg Foreign Subsidiaries Other Program          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfers of Accounts Receivable Agreements $ 36   $ 36   $ 66