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Other assets impairments, restructuring and other items - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Restructuring and Impairment Costs [Line Items]        
Impairments of long-lived tangible assets [1] $ 75 $ 20    
Impairments of property, plant and equipment   20    
Business combination contingent consideration arrangements change in amount of contingent consideration liability 6 (71)    
Restructuring costs 39 32    
Recall and inventory reserves cost       $ 54
Scenario, Forecast [Member]        
Restructuring and Impairment Costs [Line Items]        
Expected revenue from Florida manufacturing plant in 2020     $ 230  
Restructuring Cost [Member]        
Restructuring and Impairment Costs [Line Items]        
Business combination contingent consideration arrangements change in amount of contingent consideration liability $ 6 $ 71    
[1] Including impairments related to exit and disposal activities