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Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 02, 2018
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Business Acquisition [Line Items]          
Amortization       $ 14 $ 9
Equity Method Investment, Realized Gain (Loss) on Disposal       0 200
Operating profit   $ 397 $ 474 778 984
Net income attributable to Kellogg Company   $ 286 596 568 1,040
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     3,433 7,043  
Business Acquisition, Pro Forma Net Income (Loss)     596 $ 1,040  
Equity method investment, ownership percentage 51.00%        
Equity Method Investment, Realized Gain (Loss) on Disposal     $ 245   $ 245