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26. POST-EMPLOYMENT OBLIGATIONS (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]        
Expense amount recognized in the Statement of income   R$ 56 R$ 68 R$ 65
Estimate of contributions expected to be paid to plan for next annual reporting period R$ 1,059      
Description of insurance policy       On 2017, the Company changed its life insurance policy, resulting in reduction of the retirees’ capital insured by 20% at each 5-year interval, from aged 60, down to a minimum of 20%. These changes resulted in a reduction of R$ 619 in the post-employment obligations reported on December 31, 2017, with counterpart in the Statement of income in 2017.
Forluz Pension Fund [Member]        
Disclosure of defined benefit plans [line items]        
Obligation for past actuarial deficits relating to pension fund   R$ 566 652  
Inflation index rate   6.00%    
Funded Benefit Plan ('Plan A') [Member]        
Disclosure of defined benefit plans [line items]        
Benefit amount payable   R$ 550 378  
Remuneratory interest applicable on outstanding balance   6.00%    
Estimate of contributions expected to be paid to plan for next annual reporting period 286      
Postretirement Benefits Plan [Member]        
Disclosure of defined benefit plans [line items]        
Expense amount recognized in the Statement of income   R$ 408 337 R$ 391
Finance expenses   R$ 56 R$ 68 R$ 65
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]        
Estimate of contributions expected to be paid to plan for next annual reporting period R$ 79