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Identifiable Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets useful life     11 years  
Amortization of intangible assets $ 297 $ 357 $ 909 $ 1,088
Impairment of intangible assets excluding goodwill $ 519 $ 355 1,246 $ 409
IPR&D to product rights     553  
Mesalamine [Member]        
Finite-Lived Intangible Assets [Line Items]        
IPR&D to product rights     103  
Fremanezumab [Member]        
Finite-Lived Intangible Assets [Line Items]        
IPR&D to product rights     $ 444