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Legal Settlements and Loss Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]      
Legal settlements and loss contingencies, expense $ 60 $ 1,178  
Legal settlements, income     $ 1,208
Accrued amount for legal settlements and loss contingencies $ 1,625 $ 1,580  
Settlement On Account Of Product Liability [Member] | United States [Member]      
Loss Contingencies [Line Items]      
Restructuring expense and income The expenses in 2020 were mainly related to a fine imposed by the European Commission in relation to a 2005 patent settlement agreement and an increase of a reserve for certain product liability claims in the United States, partially offset by proceeds received following a settlement of the FCPA derivative proceedings in Israel and settlement of an action brought against the sellers of Auden McKenzie (an acquisition made by Actavis Generics). The expenses in 2019 were mainly related to an estimated provision recorded in connection with potential settlement of the opioid cases.