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Divestiures, West Africa Investments and Acquisitions Multipro Schedule of Pro Forma Results Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 28, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Dec. 29, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Business Acquisition [Line Items]                      
Net sales $ 3,223 $ 3,372 $ 3,461 $ 3,522 $ 3,317 $ 3,469 $ 3,360 $ 3,401 $ 13,578 $ 13,547 $ 12,854
Net income attributable to Kellogg $ 145 $ 247 $ 286 $ 282 $ (84) [1] $ 380 $ 596 $ 444 960 1,336 1,254
Equity Method Investment, Realized Gain (Loss) on Disposal                 $ 0 200 $ 0
Multipro                      
Business Acquisition [Line Items]                      
Net sales                   536  
Net income attributable to Kellogg                   8  
Equity Method Investment, Realized Gain (Loss) on Disposal                   $ 245  
[1]
The significant decrease in the fourth quarter 2018 net income is primarily due to a mark-to-market adjustment recognized on pension assets.