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24. POST-EMPLOYMENT OBLIGATIONS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position R$ 6,843 R$ 6,709 R$ 4,989 R$ 4,186
Pension plans and retirement supplement plans [member]        
Disclosure of defined benefit plans [line items]        
Fair value of plan assets (10,420) (10,366) (9,063) (8,546)
Health plan [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 3,319 3,102 2,344 1,809
Pension plans and retirement supplement plans [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 2,909 2,972 2,170 2,068
Dental plan [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 64 61 48 38
Life insurance plan [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 551 574 R$ 427 R$ 271
Actuarial assumption of expected rates of pension increases [member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 17,242 17,022    
Fair value of plan assets (10,420) (10,366)    
Net liabilities in the statement of financial position 6,843 6,709    
Actuarial assumption of expected rates of pension increases [member] | Initial net liabilities [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 6,822 6,656    
Actuarial assumption of expected rates of pension increases [member] | Effect of asset ceiling [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 21 53    
Actuarial assumption of expected rates of pension increases [member] | Pension plans and retirement supplement plans [member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 13,308 13,285    
Fair value of plan assets (10,420) (10,366)    
Net liabilities in the statement of financial position 2,909 2,972    
Actuarial assumption of expected rates of pension increases [member] | Pension plans and retirement supplement plans [member] | Initial net liabilities [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 2,888 2,919    
Actuarial assumption of expected rates of pension increases [member] | Pension plans and retirement supplement plans [member] | Effect of asset ceiling [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 21 53    
Actuarial assumption of expected rates of pension increases [member] | Health plan [member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 3,319 3,102    
Net liabilities in the statement of financial position 3,319 3,102    
Actuarial assumption of expected rates of pension increases [member] | Health plan [member] | Initial net liabilities [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 3,319 3,102    
Actuarial assumption of expected rates of pension increases [member] | Dental plan [member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 64 61    
Net liabilities in the statement of financial position 64 61    
Actuarial assumption of expected rates of pension increases [member] | Dental plan [member] | Initial net liabilities [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 64 61    
Actuarial assumption of expected rates of pension increases [member] | Life insurance [member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 551 574    
Net liabilities in the statement of financial position 551 574    
Actuarial assumption of expected rates of pension increases [member] | Life insurance [member] | Initial net liabilities [member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position R$ 551 R$ 574