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Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
May 02, 2018
Mar. 30, 2019
Mar. 31, 2018
Business Acquisition [Line Items]      
Amortization   $ 7 $ 3
Operating profit   381 510
Net income attributable to Kellogg Company   $ 282 444
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     3,609
Business Acquisition, Pro Forma Net Income (Loss)     $ 444
Equity method investment, ownership percentage 51.00%    
Equity Method Investment, Realized Gain (Loss) on Disposal $ 245