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Identifiable Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets useful life     12 years  
Amortization of intangible assets $ 255 $ 297 $ 823 $ 909
IPR&D to product rights 15   271  
Impairment of intangible assets excluding goodwill 177 $ 519 1,206 $ 1,246
Methyl ER [Member]        
Finite-Lived Intangible Assets [Line Items]        
IPR&D to product rights     174  
Lenalidomide Product [Member]        
Finite-Lived Intangible Assets [Line Items]        
Impairment of intangible assets excluding goodwill     125  
In Process Research and Development [Member]        
Finite-Lived Intangible Assets [Line Items]        
Impairment of intangible assets excluding goodwill 78   539  
Actavis [Member]        
Finite-Lived Intangible Assets [Line Items]        
Impairment of intangible assets excluding goodwill     59  
Actavis [Member] | In Process Research and Development [Member]        
Finite-Lived Intangible Assets [Line Items]        
Business combination recognized identifiable assets 1,626   1,626  
Actavis [Member] | In Process Research and Development [Member] | Lenalidomide Product [Member]        
Finite-Lived Intangible Assets [Line Items]        
Impairment of intangible assets excluding goodwill     355  
Actavis [Member] | Identifiable product rights [Member]        
Finite-Lived Intangible Assets [Line Items]        
Impairment of intangible assets excluding goodwill 99   667  
Rimsa [Member] | In Process Research and Development [Member]        
Finite-Lived Intangible Assets [Line Items]        
Business combination recognized identifiable assets 46   46  
AUSTEDO [Member] | In Process Research and Development [Member]        
Finite-Lived Intangible Assets [Line Items]        
Business combination recognized identifiable assets $ 211   $ 211