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Other assets impairments, restructuring and other items - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Positions
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Restructuring and Impairment Costs [Line Items]      
Impairments of property, plant and equipment $ 139 $ 500 $ 544
Business combination contingent consideration arrangements change in amount of contingent consideration liability 59 57 154
Restructuring costs $ 199 $ 488 $ 535
Number of positions eliminated | Positions 13,000    
Recall and inventory reserves cost $ 54    
Expected revenue from Florida manufacturing plant in 2020 $ 230