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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