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Share-based payment - Summary of Expenses on Stock Based Payment Plans (Detail) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Compensation expense by plan R$ (626) R$ (603) R$ (536)
Partner plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Compensation expense by plan (242) (226) (234)
Variable compensation plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Compensation expense by plan R$ (384) R$ (377) R$ (302)