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Other assets impairments, restructuring and other items - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Positions
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Positions
Sep. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Restructuring and Impairment Costs [Line Items]          
Impairments of long-lived tangible assets [1] $ 28 $ 2 $ 96 $ 255  
Business combination contingent consideration arrangements change in amount of contingent consideration liability 51 29 4 84  
Restructuring costs $ 61 88 $ 140 442  
Number of positions eliminated | Positions 11,554   11,554    
Expected revenue from Florida manufacturing plant     $ 63    
Recall and inventory reserves cost     55    
Scenario, Forecast [Member]          
Restructuring and Impairment Costs [Line Items]          
Expected revenue from Florida manufacturing plant         $ 230
Restructuring Cost [Member]          
Restructuring and Impairment Costs [Line Items]          
Impairments of property, plant and equipment $ 8 $ 2 $ 29 $ 155  
[1] Including impairments related to exit and disposal activities