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Goodwill and Intangible Assets - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
brand
Sep. 30, 2018
USD ($)
brand
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
brand
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization expense for intangible assets $ 43   $ 44 $ 87 $ 88
Estimated amortization expense in year 1 170     170  
Estimated amortization expense in year 2 170     170  
Estimated amortization expense in year 3 85     85  
Estimated amortization expense in year 4 85     85  
Estimated amortization expense in year 5 $ 85     $ 85  
Trademarks          
Goodwill and Intangible Assets Disclosure [Line Items]          
Asset impairments   $ 68      
Number of impaired trademarks | brand 5 5   5  
Number of trademarks with fair value in excess of book value, 10% or less | brand 7     7  
Book value of trademarks with fair value in excess of book value, 10% or less $ 536     $ 536  
Europe | Trademarks | Gum, Chocolate, Biscuits and Candy          
Goodwill and Intangible Assets Disclosure [Line Items]          
Asset impairments   $ 45      
North America | Trademarks | Gum, Chocolate, Biscuits and Candy          
Goodwill and Intangible Assets Disclosure [Line Items]          
Asset impairments   14      
AMEA | Trademarks | Gum, Chocolate, Biscuits and Candy          
Goodwill and Intangible Assets Disclosure [Line Items]          
Asset impairments   $ 9