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Goodwill and Intangible Assets - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
brand
Sep. 30, 2024
brand
Goodwill and Intangible Assets Disclosure [Line Items]        
Amortization expense for intangible assets | $ $ 37 $ 38    
Europe | Biscuits        
Goodwill and Intangible Assets Disclosure [Line Items]        
Number of brands with impairment charges     2  
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  
AMEA | Biscuits        
Goodwill and Intangible Assets Disclosure [Line Items]        
Number of brands with impairment charges     1  
Brands        
Goodwill and Intangible Assets Disclosure [Line Items]        
Indefinite-lived intangible asset impairment charges | $     $ 153  
Number of brands with fair value in excess of book value of 10% or less       13
Book value of brands with fair value in excess of book value of 10% or less | $ $ 3,000