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Income taxes - Income tax reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Notes and other explanatory information [abstract]        
Income before income taxes $ 2,720 $ 5,056 $ 5,016 $ 11,625
Income taxes at statutory rate (34%) (925) (1,719) (1,705) (3,953)
Adjustments that affect the taxes basis:        
Tax incentives 497 565 902 1,059
Equity results 33 22 3 30
Addition (reduction) of tax loss carryforward (172) 211 (243) (444)
Reversal of deferred income tax related to Renova Foundation (1,078) (1,078)
Other (147) 10 (89) 306
Income taxes (1,792) (911) (2,210) (3,002)
Current tax (404) (1,181) (622) (1,434)
Deferred tax $ (1,388) $ 270 $ (1,588) $ (1,568)