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Identifiable Intangible Assets - Schedule of Finite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment $ 25,152 $ 25,971
Accumulated amortization 8,940 8,331
Net carrying amount 16,212 17,640
Identifiable product rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 20,944 21,011
Accumulated amortization 8,867 8,276
Net carrying amount 12,077 12,735
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 609 617
Accumulated amortization 73 55
Net carrying amount 536 562
In Process Research and Development [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount net of impairment 3,599 4,343
Net carrying amount $ 3,599 $ 4,343