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26. POST-EMPLOYMENT OBLIGATIONS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance R$ 13,892 R$ 12,663 R$ 12,306
Cost of current service 18 15 19
Interest on the actuarial obligation 1,213 1,161 1,246
Actuarial losses (gains):      
Due to changes in demographic assumptions 6   191
Due to changes in financial assumptions 2,775 903 537
Due to adjustments based on experience 160 161 (53)
Due to changes and adjustments 2,941 1,064 675
Plan amendment - Past service     (619)
Benefits paid (1,042) (1,011) (964)
Ending balance 17,022 13,892 12,663
Pension Plans and Retirement Supplement Plans [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 11,073 10,545 9,743
Cost of current service 1 4 5
Interest on the actuarial obligation 963 959 980
Actuarial losses (gains):      
Due to changes in demographic assumptions 6   191
Due to changes in financial assumptions 2,058 467 414
Due to adjustments based on experience 83 (20) 53
Due to changes and adjustments 2,147 447 658
Plan amendment - Past service    
Benefits paid (899) (881) (841)
Ending balance 13,285 11,073 10,545
Health Plan [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 2,344 1,809 1,711
Cost of current service 14 10 11
Interest on the actuarial obligation 208 172 178
Actuarial losses (gains):      
Due to changes in demographic assumptions  
Due to changes in financial assumptions 576 402 66
Due to adjustments based on experience 91 68 (44)
Due to changes and adjustments 667 470 22
Plan amendment - Past service    
Benefits paid (131) (118) (113)
Ending balance 3,102 2,344 1,809
Dental Plan [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 48 39 38
Cost of current service 0
Interest on the actuarial obligation 5 4 3
Actuarial losses (gains):      
Due to changes in demographic assumptions  
Due to changes in financial assumptions 11 8 2
Due to adjustments based on experience (2)
Due to changes and adjustments 11 8
Plan amendment - Past service    
Benefits paid (2) (3) (2)
Ending balance 61 48 39
Life Insurance Plan [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 427 270 814
Cost of current service 3 2 3
Interest on the actuarial obligation 38 25 85
Actuarial losses (gains):      
Due to changes in demographic assumptions  
Due to changes in financial assumptions 130 26 55
Due to adjustments based on experience (14) 113 (60)
Due to changes and adjustments 116 139 (5)
Plan amendment - Past service     (619)
Benefits paid (10) (9) (8)
Ending balance R$ 574 R$ 427 R$ 270