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24. POST-EMPLOYMENT OBLIGATIONS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance R$ 17,022 R$ 13,892 R$ 12,663
Cost of current service 26 17 15
Interest on actuarial obligation 1,147 1,214 1,161
Actuarial losses (gains):      
Due to changes in demographic assumptions 534 6  
Due to changes in financial assumptions (565) 1,599 705
Due to adjustments based on experience 148 160 161
Due to changes and adjustments (117) (2,941) (1,064)
Benefits paid (1,070) (1,042) (1,011)
Ending balance 17,242 17,022 13,892
Pension plans and retirement supplement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 13,285 11,073 10,545
Cost of current service 1 1 4
Interest on actuarial obligation 887 963 959
Actuarial losses (gains):      
Due to changes in demographic assumptions 135 6  
Due to changes in financial assumptions (375) 2,058 467
Due to adjustments based on experience 289 83 (20)
Due to changes and adjustments (49) (2,147) (447)
Benefits paid (914) (899) (881)
Ending balance 13,308 13,285 11,073
Health plan [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 3,102 2,344 1,809
Cost of current service 21 14 10
Interest on actuarial obligation 215 208 172
Actuarial losses (gains):      
Due to changes in demographic assumptions 395  
Due to changes in financial assumptions (152) 667 402
Due to adjustments based on experience (119) 91 68
Due to changes and adjustments (124) (667) (470)
Benefits paid (143) (131) (118)
Ending balance 3,319 3,102 2,344
Dental plan [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 61 48 39
Cost of current service 1
Interest on actuarial obligation 4 5 4
Actuarial losses (gains):      
Due to changes in demographic assumptions 4  
Due to changes in financial assumptions (4) 10 8
Due to adjustments based on experience 1
Due to changes and adjustments (1) (11) (8)
Benefits paid (3) (2) (3)
Ending balance 64 61 48
Life insurance plan [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 574 427 270
Cost of current service 3 3 2
Interest on actuarial obligation 41 38 25
Actuarial losses (gains):      
Due to changes in demographic assumptions  
Due to changes in financial assumptions (34) 117 140
Due to adjustments based on experience (23) (14) 113
Due to changes and adjustments 57 (116) (139)
Benefits paid (10) (10) (9)
Ending balance R$ 551 R$ 574 R$ 427