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Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 02, 2018
May 31, 2018
Oct. 31, 2017
Sep. 29, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Business Acquisition [Line Items]                
Purchase price adjustment             $ (1)  
Amortization             16 $ 8
Equity Method Investment, Realized Gain (Loss) on Disposal             200 0
Net sales       $ 3,469   $ 3,246 10,230 9,669
Operating profit       396   333 1,380 998
Net income attributable to Kellogg Company       380   288 1,420 837
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   3,412 10,511 10,151
Business Acquisition, Pro Forma Net Income (Loss)       380   $ 289 1,420 $ 837
Equity method investment, ownership percentage 51.00%              
Business combination fair value of equity interest   $ 626            
Business combination fair value of equity interest, net of cash acquired   $ 617            
Purchase price adjustment       1        
Equity Method Investment, Realized Gain (Loss) on Disposal $ 245              
RXBAR                
Business Acquisition [Line Items]                
Payments to acquire business, gross     $ 600          
Payments to acquire business, net of cash     $ 596          
Purchase price adjustment         $ (1)      
Deferred tax liabilities and goodwill | Multipro                
Business Acquisition [Line Items]                
Purchase price adjustment       $ (4)        
Asia Pacific                
Business Acquisition [Line Items]                
Purchase price adjustment             0  
Amortization             8  
Asia Pacific | Multipro                
Business Acquisition [Line Items]                
Net sales             328  
Net income attributable to Kellogg Company             6  
North America Other                
Business Acquisition [Line Items]                
Purchase price adjustment             (1)  
Amortization             1  
North America Other | RXBAR                
Business Acquisition [Line Items]                
Net sales             $ 167