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Other assets impairments, restructuring and other items - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Restructuring and Impairment Costs [Line Items]          
Impairments of long-lived tangible assets [1] $ 277 $ 48 $ 352 $ 68  
Impairments of property, plant and equipment 277   352    
Business combination contingent consideration arrangements change in amount of contingent consideration liability 76 24 83 (47)  
Restructuring costs 33 47 73 79  
Scenario, Forecast [Member]          
Restructuring and Impairment Costs [Line Items]          
Expected revenue from Florida manufacturing plant in 2020         $ 161
Restructuring Cost [Member]          
Restructuring and Impairment Costs [Line Items]          
Business combination contingent consideration arrangements change in amount of contingent consideration liability $ 76 $ 24 $ 83 $ 47  
[1] Including impairments related to exit and disposal activities