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Income taxes - Assets and liabilities (Details)
R$ in Millions, $ in Millions
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
BRL (R$)
Deferred income tax assets and liabilities                  
Assets $ 11,441 $ 10,335              
Liabilities (1,881) (1,770) $ (1,882) $ (337) R$ (1,883) $ (337) R$ (1,883) $ (337) R$ (1,883)
Deferred tax asset $ 9,560 $ 8,565 $ 7,335