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Provisions, contingent assets and contingent liabilities (Tables)
 12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of civil, labor and other risks provisions
         
      12/31/2024
    Note Civil Labor Other Risks Total
Opening balance - 01/01   3,203 7,821 2,141 13,165
(-) Provisions guaranteed by indemnity clause 2c XII (205) (962) - (1,167)
Subtotal   2,998 6,859 2,141 11,998
Adjustment / Interest 23 122 515 - 637
Changes in the period reflected in income 23 1,487 3,539 325 5,351
Increase   2,062 3,958 325 6,345
Reversal   (575) (419) - (994)
Payment / Transfer   (1,569) (3,371) (1,400) (6,340)
Subtotal   3,038 7,542 1,066 11,646
(+) Provisions guaranteed by indemnity clause 2c XII 169 671 - 840
Closing balance   3,207 8,213 1,066 12,486
Current   1,535 3,443 115 5,093
Non-current   1,672 4,770 951 7,393
             
      12/31/2023
    Note Civil Labor Other Risks Total
Opening balance - 01/01   3,231 8,186 1,844 13,261
(-) Provisions guaranteed by indemnity clause 2c XII (207) (952) - (1,159)
Subtotal   3,024 7,234 1,844 12,102
Adjustment / Interest 23 129 288 - 417
Changes in the period reflected in income 23 1,340 2,373 332 4,045
Increase    1,913 2,729 363 5,005
Reversal   (573) (356) (31) (960)
Payment / Transfer   (1,495) (3,036) (35) (4,566)
Subtotal   2,998 6,859 2,141 11,998
(+) Provisions guaranteed by indemnity clause 2c XII 205 962 - 1,167
Closing balance   3,203 7,821 2,141 13,165
Current   1,499 2,922 2,141 6,562
Non-current   1,704 4,899 - 6,603
Schedule of social security provisions
     
    Note 12/31/2024 12/31/2023
Opening balance - 01/01   6,579 6,214
(-) Provisions guaranteed by indemnity clause 2c XII (79) (75)
Subtotal   6,500 6,139
Adjustment / Interest (1)   543 382
Changes in the period reflected in income   (274) 373
Increase (1)   61 722
Reversal (1)   (335) (349)
Payment   (129) (394)
Subtotal   6,640 6,500
(+) Provisions guaranteed by indemnity clause 2c XII 83 79
Closing balance   6,723 6,579
Current   - -
Non-current   6,723 6,579
1) The amounts are included in the headings Tax Expenses, General and Administrative Expenses and Current Income Tax and Social Contribution.
Schedule of guarantees of contingencies, provisions and legal obligations
             
    12/31/2024   12/31/2023
  Note Civil Labor Tax Total   Total
Deposits in guarantee 18a 1,961 2,094 9,607 13,662   13,277
Investment fund quotas   458 74 2 534   574
Surety   73 60 5,320 5,453   5,683
Insurance bond   2,024 1,716 18,692 22,432   21,011
Guarantee by government securities   - - 361 361   325
Total   4,516 3,944 33,982 42,442   40,870