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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net revenues $ 3,870 $ 4,177   $ 8,227 $ 8,326
Net revenues [Member]          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net revenues   4,177 $ 4,149   8,326
Cost of sales [Member]          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net revenues   2,284 2,293   4,577
As reported [Member] | Net revenues [Member]          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net revenues   4,337 4,295   8,632
As reported [Member] | Cost of sales [Member]          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net revenues   2,443 2,440   4,883
Restatement adjustment [Member] | Net revenues [Member]          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net revenues   (159) (146)   (306)
Restatement adjustment [Member] | Cost of sales [Member]          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net revenues   $ (159) $ (146)   $ (306)