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Sale of Accounts Receivable - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Jan. 02, 2021
Monetization Program | Other income (expense)          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Gain (Loss) on Sale of Accounts Receivable $ (2) $ (3) $ (4) $ (8)  
Monetization Program | Maximum [Member]          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfers of Accounts Receivable Agreements 1,033   1,033    
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 793   793   $ 783
Kellogg Foreign Subsidiaries Other Program          
Transfer of Financial Assets Accounted for as Sales [Line Items]          
Transfers of Accounts Receivable Agreements $ 33   $ 33   $ 55