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Identifiable Intangible Assets - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets useful life         8 years
Amortization of intangible assets $ 144 $ 146 $ 436 $ 444  
Impairment of intangible assets excluding goodwill $ 64 28 $ 227 169  
Minimum [Member] | Measurement input, discount rate [Member]          
Finite-Lived Intangible Assets [Line Items]          
Business combination, contingent consideration, liability, measurement input 8.25   8.25    
Maximum [Member] | Measurement input, discount rate [Member]          
Finite-Lived Intangible Assets [Line Items]          
Business combination, contingent consideration, liability, measurement input 11   11    
Generic Pipeline Products [Member] | In Process Research And Development To Product Rights [Member] | Development Progress And Changes In Other Key Valuation Assumptions [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets excluding goodwill $ 7   $ 17 33  
In process research and development [Member] | Minimum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Business combination, contingent consideration, liability, measurement input 8.25   8.25    
In process research and development [Member] | Maximum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Business combination, contingent consideration, liability, measurement input 9.25   9.25    
In process research and development [Member] | Maximum [Member] | Measurement input, discount rate [Member]          
Finite-Lived Intangible Assets [Line Items]          
Business combination, contingent consideration, liability, measurement input 90   90    
Identifiable product rights [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets excluding goodwill   $ 28 $ 210 $ 136  
United States [Member] | Identifiable product rights [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets excluding goodwill $ 57   87    
Europe [Member] | Identifiable product rights [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets excluding goodwill     $ 123