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Identifiable Intangible Assets - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Amortization of intangible assets useful life 11 years
Amortization of intangible assets $ 310
Impairment of intangible assets excluding goodwill 206
IPR&D to product rights $ 103