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24. POST-EMPLOYMENT OBLIGATIONS (Details 5) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Current service cost R$ (26) R$ (17) R$ (15)
Interest on the actuarial obligation (1,147) (1,214) (1,161)
Estimated total expense in 2020 as per actuarial report 10 1,599 705
Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Current service cost 27    
Interest on the actuarial obligation 1,159    
Expected return on the assets of the Plan (685)    
Estimated total expense in 2020 as per actuarial report 501    
Pension plans and retirement supplement plans [member]      
Disclosure of defined benefit plans [line items]      
Current service cost (1) (1) (4)
Interest on the actuarial obligation (887) (963) (959)
Expected return on the assets of the Plan 757 2,003 1,220
Pension plans and retirement supplement plans [member] | Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Current service cost 2    
Interest on the actuarial obligation 884    
Expected return on the assets of the Plan (685)    
Estimated total expense in 2020 as per actuarial report 201    
Health plan [member]      
Disclosure of defined benefit plans [line items]      
Current service cost (21) (14) (10)
Interest on the actuarial obligation (215) (208) (172)
Estimated total expense in 2020 as per actuarial report 124 667 402
Health plan [member] | Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Current service cost 21    
Interest on the actuarial obligation 231    
Expected return on the assets of the Plan    
Estimated total expense in 2020 as per actuarial report 252    
Dental plan [member]      
Disclosure of defined benefit plans [line items]      
Current service cost (1)
Interest on the actuarial obligation (4) (5) (4)
Estimated total expense in 2020 as per actuarial report 1 10 8
Dental plan [member] | Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Current service cost 1    
Interest on the actuarial obligation 5    
Expected return on the assets of the Plan    
Estimated total expense in 2020 as per actuarial report 6    
Life insurance plan [member]      
Disclosure of defined benefit plans [line items]      
Current service cost (3) (3) (2)
Interest on the actuarial obligation (41) (38) (25)
Estimated total expense in 2020 as per actuarial report (57) R$ 117 R$ 140
Life insurance plan [member] | Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Current service cost 3    
Interest on the actuarial obligation 39    
Expected return on the assets of the Plan    
Estimated total expense in 2020 as per actuarial report R$ 42