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Income taxes - Settlement program (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
installment
Dec. 31, 2020
USD ($)
Income taxes    
Current income tax and social contribution settlement liability $ 356 $ 340
Non-current income tax and social contribution settlement liability 2,336 2,404
REFIS liabilities $ 2,692 $ 2,744
SELIC rate (in percentage) 4.25% 2.00%
Remaining monthly installments of settlement liability | installment 88