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Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 02, 2018
Sep. 28, 2019
Sep. 29, 2018
Jun. 30, 2018
Sep. 28, 2019
Sep. 29, 2018
Business Acquisition [Line Items]            
Amortization         $ 20 $ 16
Equity Method Investment, Realized Gain (Loss) on Disposal         0 200
Operating profit   $ 263 $ 396   1,041 1,380
Net income attributable to Kellogg Company   $ 247 380   815 $ 1,420
Tolaram Africa Foods (TAF) PTE LTD            
Business Acquisition [Line Items]            
Equity method investment, ownership percentage 50.00%          
Payments to acquire business, gross $ 419          
Equity method investment aggregate cost $ 458          
Equity Method Investment, Other than Temporary Impairment       $ 45    
TAF Investment in Affiliated Food Manufacturer            
Business Acquisition [Line Items]            
Equity method investment, ownership percentage 49.00%          
Affiliated Food Manufacturer            
Business Acquisition [Line Items]            
Equity method investment, ownership percentage 24.50%          
Multipro            
Business Acquisition [Line Items]            
Equity method investment incremental ownership percentage change 1.00%          
Business Acquisition, Pro Forma Revenue     3,469   10,512  
Business Acquisition, Pro Forma Net Income (Loss)     $ 380   $ 1,420  
Equity method investment, ownership percentage 51.00%          
Equity Method Investment, Realized Gain (Loss) on Disposal       $ 245