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Other assets impairments, restructuring and other items - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring and Impairment Costs [Line Items]        
Impairments of property, plant and equipment $ 416 $ 139 $ 500  
Business combination contingent consideration arrangements change in amount of contingent consideration liability (81) 59 57  
Restructuring costs 120 $ 199 $ 488  
Expected revenue from Florida manufacturing plant in 2020 $ 190      
Restructuring plan cost reduction       $ 3,000