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Goodwill and Intangible Assets - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Brand
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 02, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization expense for intangible assets   $ 178,000,000 $ 176,000,000 $ 181,000,000  
Estimated amortization expense in year 1   175,000,000      
Estimated amortization expense in year 2   175,000,000      
Estimated amortization expense in year 3   175,000,000      
Estimated amortization expense in year 4   85,000,000      
Estimated amortization expense in year 5   85,000,000      
Goodwill, Divestitures   114,000,000 4,000,000    
Intangible Assets, Divestitures   100,000,000 8,000,000    
Business acquisition, goodwill adjustments   15,000,000      
Intangible Assets, Acquisition   7,000,000      
Business acquisition, goodwill   21,085,000,000 20,276,000,000 20,664,000,000  
Intangible asset impairment   109,000,000 137,000,000 83,000,000  
Impairment of goodwill   0 0 0  
Number of brands impaired trademarks | Brand 5        
Number of brands | Brand 13        
Indefinite-lived intangible assets at risk   17,671,000,000 17,004,000,000    
Burton's Biscuit Company          
Goodwill and Intangible Assets Disclosure [Line Items]          
Business acquisition, goodwill adjustments     76,000,000    
Business acquisition, goodwill     385,000,000   $ 173,000,000
North America Segment          
Goodwill and Intangible Assets Disclosure [Line Items]          
Business acquisition, goodwill   8,933,000,000 8,885,000,000    
Intangible asset impairment   1,000,000      
Europe Segment          
Goodwill and Intangible Assets Disclosure [Line Items]          
Business acquisition, goodwill   7,880,000,000 7,170,000,000    
Asia Middle East Africa Segment          
Goodwill and Intangible Assets Disclosure [Line Items]          
Business acquisition, goodwill   3,371,000,000 3,324,000,000    
FRANCE          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill, Divestitures   23,000,000      
Intangible Assets, Divestitures   62,000,000      
Vietnam          
Goodwill and Intangible Assets Disclosure [Line Items]          
Finite-lived intangible assets acquired     25,000,000    
Indefinite-lived intangible assets acquired     61,000,000    
Trademarks          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment $ 70,000,000 70,000,000 98,000,000 71,000,000  
Trademarks | North America Segment          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment   38,000,000 19,000,000    
Trademarks | Europe Segment          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     19,000,000    
Trademarks | Asia Middle East Africa Segment          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     19,000,000    
Trademarks | Venezuela          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment       $ 12,000,000  
Fair Value Over Book Value 10% or Less | Trademarks          
Goodwill and Intangible Assets Disclosure [Line Items]          
Indefinite-lived intangible assets at risk $ 963,000,000        
Equity Method Investments          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible assets   14,000,000      
Sale Of Confectionery Business In Costa Rica | Japan          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill, divested   5,000,000      
Intangible assets   24,000,000      
Sale Of Confectionery Business In France | Trademarks | Europe Segment          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible asset impairment     20,000,000    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Australia And New Zealand          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill, Divestitures   $ 86,000,000      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | FINLAND          
Goodwill and Intangible Assets Disclosure [Line Items]          
Intangible assets     8,000,000    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sale Of Confectionery Business In Costa Rica | COSTA RICA          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill, divested     $ 4,000,000