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26. POST-EMPLOYMENT OBLIGATIONS (Details 5) - 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]        
Current service cost   R$ (18) R$ (15) R$ (19)
Interest on the actuarial obligation   (1,213) (1,161) (1,246)
Estimated total expense in 2019 as per actuarial report   2,775 903 537
Present Value of Defined Benefit Obligation [Member]        
Disclosure of defined benefit plans [line items]        
Current service cost R$ 26      
Interest on the actuarial obligation 1,147      
Expected return on the assets of the Plan (682)      
Estimated total expense in 2019 as per actuarial report 491      
Pension Plans and Retirement Supplement Plans [Member]        
Disclosure of defined benefit plans [line items]        
Current service cost   (1) (4) (5)
Interest on the actuarial obligation   (963) (959) (980)
Expected return on the assets of the Plan   2,003 1,220 1,100
Estimated total expense in 2019 as per actuarial report   2,058 467 414
Pension Plans and Retirement Supplement Plans [Member] | Present Value of Defined Benefit Obligation [Member]        
Disclosure of defined benefit plans [line items]        
Current service cost 1      
Interest on the actuarial obligation 887      
Expected return on the assets of the Plan (682)      
Estimated total expense in 2019 as per actuarial report 206      
Health Plan [Member]        
Disclosure of defined benefit plans [line items]        
Current service cost   (14) (10) (11)
Interest on the actuarial obligation   (208) (172) (178)
Estimated total expense in 2019 as per actuarial report   576 402 66
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 215      
Expected return on the assets of the Plan      
Estimated total expense in 2019 as per actuarial report 236      
Dental Plan [Member]        
Disclosure of defined benefit plans [line items]        
Current service cost   0
Interest on the actuarial obligation   (5) (4) (3)
Estimated total expense in 2019 as per actuarial report   11 8 2
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 4      
Expected return on the assets of the Plan      
Estimated total expense in 2019 as per actuarial report 5      
Life Insurance Plan [Member]        
Disclosure of defined benefit plans [line items]        
Current service cost   (3) (2) (3)
Interest on the actuarial obligation   (38) (25) (85)
Estimated total expense in 2019 as per actuarial report   R$ 130 R$ 26 R$ 55
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 41      
Expected return on the assets of the Plan      
Estimated total expense in 2019 as per actuarial report R$ 44