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26. POST-EMPLOYMENT OBLIGATIONS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position R$ 6,709 R$ 4,989 R$ 4,186 R$ 4,242
Pension Plans and Retirement Supplement Plans [Member]        
Disclosure of defined benefit plans [line items]        
Fair value of plan assets (10,366) (9,063) (8,546) (8,128)
Pension And Retirement Supplement Plans [Member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 2,972 2,170 2,068 1,679
Dental Plan [Member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 61 48 38 38
Health Plan [Member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 3,102 2,344 1,809 1,711
Life Insurance Plan [Member]        
Disclosure of defined benefit plans [line items]        
Net liabilities in the statement of financial position 574 427 R$ 271 R$ 814
Actuarial Assumption of Expected Rates of Pension Increases [Member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 17,022 13,892    
Fair value of plan assets (10,366) (9,062)    
Net liabilities in the statement of financial position 6,709 4,989    
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 6,656 4,830    
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 53 159    
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 13,285 11,073    
Fair value of plan assets (10,366) (9,062)    
Net liabilities in the statement of financial position 2,972 2,170    
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 2,919 2,011    
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 53 159    
Actuarial Assumption of Expected Rates of Pension Increases [Member] | Dental Plan [Member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 61 48    
Net liabilities in the statement of financial position 61 48    
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 61 48    
Actuarial Assumption of Expected Rates of Pension Increases [Member] | Life Insurance [Member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 574 427    
Net liabilities in the statement of financial position 574 427    
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 574 427    
Actuarial Assumption of Expected Rates of Pension Increases [Member] | Health Plan [Member]        
Disclosure of defined benefit plans [line items]        
Present value of obligations 3,102 2,344    
Net liabilities in the statement of financial position 3,102 2,344    
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 R$ 3,102 R$ 2,344