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24. POST-EMPLOYMENT OBLIGATIONS (Details 6)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits R$ 1,121
Pension plans and retirement supplement plans [member]  
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits 928
Health plan [member]  
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits 172
Dental plan [member]  
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits 3
Life insurance plan [member]  
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits R$ 18