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Identifiable Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets useful life     11 years  
Amortization of intangible assets $ 301 $ 410 $ 611 $ 731
Impairment of intangible assets excluding goodwill $ 520 $ 52 727 $ 54
IPR&D to product rights     $ 103