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24. POST-EMPLOYMENT OBLIGATIONS (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value of plan assets [line items]      
Cost of current service R$ 26 R$ 17 R$ 15
Interest on the actuarial obligation 1,147 1,214 1,161
Expected return on the assets of the Plan (682) (767) (771)
Expense according to actuarial calculation 491 464 405
Pension plans and retirement supplement plans [member]      
Disclosure of fair value of plan assets [line items]      
Cost of current service 1 1 4
Interest on the actuarial obligation 887 963 959
Expected return on the assets of the Plan (682) (767) (771)
Expense according to actuarial calculation 206 197 192
Health plan [member]      
Disclosure of fair value of plan assets [line items]      
Cost of current service 21 14 10
Interest on the actuarial obligation 215 208 172
Expected return on the assets of the Plan
Expense according to actuarial calculation 236 222 182
Dental plan [member]      
Disclosure of fair value of plan assets [line items]      
Cost of current service 1
Interest on the actuarial obligation 4 5 4
Expected return on the assets of the Plan  
Expense according to actuarial calculation 5 5 4
Life insurance [member]      
Disclosure of fair value of plan assets [line items]      
Cost of current service 3 2 1
Interest on the actuarial obligation 41 38 26
Expected return on the assets of the Plan  
Expense according to actuarial calculation R$ 44 R$ 40 R$ 27