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Goodwill and Intangible Assets - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
brand
Sep. 30, 2024
USD ($)
brand
Sep. 30, 2025
USD ($)
brand
Sep. 30, 2024
USD ($)
Goodwill and Intangible Assets Disclosure [Line Items]        
Amortization expense for intangible assets | $ $ 32,000,000 $ 40,000,000 $ 107,000,000 $ 115,000,000
Goodwill, impairment loss | $ 0 0 $ 0 $ 0
Indefinite-lived intangible asset impairment charges | $ $ 33,000,000      
Number of brands with fair value in excess of book value of 10% or less 5   5  
With Recognized Impairment        
Goodwill and Intangible Assets Disclosure [Line Items]        
Number of brands with fair value in excess of book value of 10% or less 4   4  
Brands        
Goodwill and Intangible Assets Disclosure [Line Items]        
Indefinite-lived intangible asset impairment charges | $   $ 153,000,000    
Book value of brands with fair value in excess of book value of 10% or less | $ $ 1,500,000,000   $ 1,500,000,000  
Europe | Biscuits        
Goodwill and Intangible Assets Disclosure [Line Items]        
Number of brands with impairment charges 2 2    
AMEA | Biscuits        
Goodwill and Intangible Assets Disclosure [Line Items]        
Number of brands with impairment charges 1 1    
Latin America | Biscuits        
Goodwill and Intangible Assets Disclosure [Line Items]        
Number of brands with impairment charges   1    
Latin America | Candy        
Goodwill and Intangible Assets Disclosure [Line Items]        
Number of brands with impairment charges 1 1