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Legal Settlements and Loss Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Loss Contingencies [Line Items]          
Legal settlements and loss contingencies, expense $ 6 $ 13 $ 110    
Legal settlements, income       $ 12  
Accrued amount for legal settlements and loss contingencies $ 1,737   $ 1,737   $ 1,625
Restructuring expense and income The expense in the second quarter of 2020 was mainly due to an increase in a provision for settlement of certain product liability claims in the United States and other minor provisions, partially offset by proceeds received following a settlement of the FCPA derivative proceedings in Israel.   The income in the first six months of 2020 was mainly due to 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), partially offset by an increase in a provision for settlement of certain products liability claims in the United States and other minor provisions.