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Basis of presentation - Summary of impact of the revision on net revenues and cost of sales in the consolidated statement of income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net revenues $ 3,978 $ 4,093     $ 12,206 $ 12,420
Net revenues [Member]            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net revenues   4,093 $ 4,177 $ 4,149 12,420  
Cost of sales [Member]            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net revenues   2,264 2,284 2,293 6,841  
As reported [Member] | Net revenues [Member]            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net revenues   4,264 4,337 4,295 12,896  
As reported [Member] | Cost of sales [Member]            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net revenues   2,435 2,443 2,440 7,318  
Restatement adjustment [Member] | Net revenues [Member]            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net revenues   (171) (159) (146) (477)  
Restatement adjustment [Member] | Cost of sales [Member]            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net revenues   $ (171) $ (159) $ (146) $ (477)