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Goodwill and Intangible Assets - Additional Information (Details)
 3 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
brand
Dec. 31, 2018
USD ($)
brand
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
product
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization expense for intangible assets   $ 176,000,000 $ 178,000,000 $ 176,000,000  
Estimated amortization expense for intangible assets in year 1   170,000,000      
Estimated amortization expense for intangible assets in year 2   170,000,000      
Estimated amortization expense for intangible assets in year 3   85,000,000      
Estimated amortization expense for intangible assets in year 4   85,000,000      
Estimated amortization expense for intangible assets in year 5   85,000,000      
Goodwill, divestitures   0 114,000,000    
Intangible assets, divestitures   0 100,000,000    
Goodwill   20,725,000,000 21,085,000,000 20,276,000,000  
Business acquisition, goodwill adjustments     15,000,000    
Intangible assets acquired, adjustments     7,000,000    
Intangible asset impairment   68,000,000 109,000,000 137,000,000  
Impairment of goodwill   0 0 $ 0  
North America          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     1,000,000    
North America          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill   $ 9,173,000,000 8,933,000,000    
Biscuits          
Goodwill and Intangible Assets Disclosure [Line Items]          
Number of discontinued products | product       4  
Candy          
Goodwill and Intangible Assets Disclosure [Line Items]          
Number of discontinued products | product       1  
Trademarks          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment $ 68,000,000   70,000,000 $ 98,000,000  
Number of impaired trademarks | brand 5        
Number of trademarks with fair value in excess of book value, 10% or less | brand   7      
Book value of trademarks with fair value in excess of book value, 10% or less   $ 538,000,000      
Trademarks | Europe          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     11,000,000 22,000,000  
Trademarks | North America          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     2,000,000 32,000,000  
Trademarks | AMEA          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     52,000,000 41,000,000  
Trademarks | Latin America          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     5,000,000 3,000,000  
Trademarks | North America          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     38,000,000    
Trademarks | Gum, Chocolate, Biscuits and Candy | Europe          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment $ 45,000,000        
Trademarks | Gum, Chocolate, Biscuits and Candy | North America          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment 14,000,000        
Trademarks | Gum, Chocolate, Biscuits and Candy | AMEA          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment $ 9,000,000        
Tate’s Bake Shop | North America          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill         $ 298,000,000
Intangible assets acquired         $ 250,000,000
Equity Method Investments          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible assets     14,000,000    
Sale of Confectionery Business in France | Trademarks | Europe          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment       $ 20,000,000  
France          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill, divestitures     23,000,000    
Intangible assets, divestitures     62,000,000    
Australia and New Zealand | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill, divestitures     86,000,000    
Japan          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill of disposal group     5,000,000    
Intangible assets     $ 24,000,000