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Commitments and guarantees granted (Tables)
12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of commitments
       
    December 31, 2023   December 31, 2022
Purchase of raw materials and services   5,361   6,534
Purchase of energy   2,316   2,605
 Total   7,677   9,139
Schedule of guarantee
             
  December 31, 2023   December 31, 2022
  Guarantee Restricted cash Liability (i)   Guarantee Restricted cash Liability (i)
Associates and joint ventures 274 - -   1,522 - 103
Assets retirement obligations 910 - -   644 73 -
  1,184 - -   2,166 73 103

(i) The fair value of these financial guarantees is recorded as “Other financial liabilities” (note 14).