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24. POST-EMPLOYMENT OBLIGATIONS (Details Narrative) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 BRL (R$) | Dec. 31, 2020 BRL (R$) Installment | Dec. 31, 2019 BRL (R$) | Dec. 31, 2018 BRL (R$)
Disclosure of defined benefit plans [line items] |  |  |  |
Expense amount recognized in the Statement of income |  | R$ 53 | R$ 56 | R$ 68
Estimate of contributions expected to be paid to plan for next annual reporting period |  | 1,121 |  |
Forluz Pension Fund [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Obligation for past actuarial deficits relating to pension fund |  | R$ 473 | 566 |
Inflation index rate |  | 6.00% |  |
Funded Benefit Plan ('Plan A') [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Benefit amount payable |  | R$ 540 | 550 |
Description of monthly amortizations |  | The monthly amortizations, calculated by the constant installments system (Price Table), will be paid until 2031 for the 2015 and 2016 deficits, in the amount of R$363, and up to 2033 for the 2017 deficit, in the amount of R$177. |  |
Remuneratory interest applicable on outstanding balance |  | 6.00% |  |
Estimate of contributions expected to be paid to plan for next annual reporting period |  | R$ 160 |  |
Number of monthly installments | Installment |  | 166 |  |
Expectation of contributions in pension plan | R$ 221 |  |  |
Postretirement Benefits Plan [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Expense amount recognized in the Statement of income |  | R$ 438 | 408 | 337
Finance expenses |  | R$ 53 | R$ 56 | R$ 68
Health Plan And Dental Plan [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Actuarial assumption of expected rates of inflation |  |  |  | 1.00%
Defined Contribution Plan [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Expectation of contributions in pension plan | R$ 81 |  |  |

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