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Income taxes (Tables)
 6 Months Ended
Jun. 30, 2023
Notes and other explanatory information [abstract]  
Schedule of income tax reconciliation
         
    Three-month period ended June 30, Six-month period ended June 30,
  Notes 2023 2022 2023 2022
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 3 and 23(c) (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)
Income taxes   (1,792) (911) (2,210) (3,002)
Schedule of changes is deferred tax
     
  Assets Liabilities Deferred taxes, net
Balance at December 31, 2022 10,770 1,413 9,357
Effect in income statement (1,620) (32) (1,588)
Translation adjustment 784 32 752
Other comprehensive income (30) (2) (28)
Balance at June 30, 2023 9,904 1,411 8,493
       
Balance at December 31, 2021 11,441 1,881 9,560
Effect in income statement (1,524) 44 (1,568)
Translation adjustment 651 (1) 652
Other comprehensive income (25) 47 (72)
Transfers between assets and liabilities (183) (183) -
Other - (29) 29
Balance at June 30, 2022 10,360 1,759 8,601
Schedule of income taxes settlement
   
  June 30, 2023 December 31, 2022
Current liabilities 416 371
Non-current liabilities 1,886 1,869
REFIS liabilities 2,302 2,240
     
SELIC rate 13.75% 13.75%
Schedule of recoverable and payable taxes
   
  June 30, 2023 December 31, 2022
 

Current

assets

Non-current

assets

Current

liabilities

Current

assets

Non-current

assets

Current

liabilities

Value-added tax ("ICMS") 279 1 24 261 1 46
Brazilian federal contributions ("PIS" and "COFINS") 917 855 69 690 740 35
Income taxes 296 373 604 309 369 221
Financial compensation for the exploration of mineral resources ("CFEM") - - 66 - - 54
Other 10 - 119 12 - 114
Total 1,502 1,229 882 1,272 1,110 470