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Identifiable Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets useful life 12 years    
Amortization of intangible assets $ 1,166 $ 1,444 $ 993
2018 1,034    
2019 1,019    
2020 889    
2021 930    
2022 896    
IPR&D to product rights 723    
Impairment of intangible assets excluding goodwill 1,991 $ 3,238 $ 589
In Process Research and Development [Member]      
Finite-Lived Intangible Assets [Line Items]      
Impairment of intangible assets excluding goodwill 923    
Identifiable product rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Impairment of intangible assets excluding goodwill 1,068    
Actavis [Member] | In Process Research and Development [Member]      
Finite-Lived Intangible Assets [Line Items]      
Business combination recognized identifiable assets 2,433    
Actavis [Member] | Identifiable product rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Impairment of intangible assets excluding goodwill 412    
Rimsa [Member] | In Process Research and Development [Member]      
Finite-Lived Intangible Assets [Line Items]      
Business combination recognized identifiable assets 50    
AUSTEDO [Member] | In Process Research and Development [Member]      
Finite-Lived Intangible Assets [Line Items]      
Business combination recognized identifiable assets 211    
Fremanezumab [Member]      
Finite-Lived Intangible Assets [Line Items]      
IPR&D to product rights 444    
Mesalamine [Member]      
Finite-Lived Intangible Assets [Line Items]      
IPR&D to product rights 103    
International Markets [Member] | Identifiable product rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Impairment of intangible assets excluding goodwill 290    
Japan [Member] | Identifiable product rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Impairment of intangible assets excluding goodwill $ 222