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INTANGIBLE ASSETS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Beginning balance R$ 12,953 R$ 11,810 R$ 11,624
Amortization (956) (829) (744)
Ending balance 14,621 12,953 11,810
Disposals (57) (23) (24) [1]
Transfer 2,562 [2] 912 [2] 913 [3]
Additions 119 1,083 41
Intangible assets under development [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 161 113 82
Ending balance 206 161 113
Transfer (61) [2] (3) [2] (10) [3]
Additions 106 51 41
Temporary Easements Intangible Assets [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 10 9 8
Amortization (1) (1)  
Ending balance 9 10 9
Transfer   2 [2] 1 [3]
Service concession rights [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 5 6 7
Amortization (1) (1) (1)
Ending balance 4 5 6
Assets Of Concession [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 11,807 11,674 11,517
Amortization (817) (757) (738)
Ending balance 13,555 11,807 11,674
Disposals (57) (23) (24) [1]
Transfer 2,622 [2] 913 [2] 919 [3]
Assets Of Concession G S F [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 966  
Amortization (134) (66)  
Ending balance 832 966
Additions   1,032  
Other intangible assets [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 4 8 10
Amortization (3) (4) (5)
Ending balance 15 4 8
Transfer 1 [2]   3 [3]
Additions 13    
Useful Life Defined Intangible Asset [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 12,792 11,697 11,542
Amortization (956) (829) (744)
Ending balance 14,415 12,792 11,697
Disposals (57) (23) (24) [1]
Transfer 2,623 [2] 915 [2] R$ 923 [3]
Additions R$ 13 R$ 1,032  
[1] This includes the impairment reversal, in the amount of R$14, recognized in the Income Statement under “Other expenses”, as a result of the test of impairment of intangible assets, relating to the authorization for wind power generation granted to Volta do Rio, on December 31, 2020. More information is available on this note.
[2] The transfers were made between concession contract assets to Intangible assets: in 2022 of R$2,448 (R$902 in 2021).
[3] The transfers were made between Intangible assets, concession contract assets, financial assets and property, plant and equipment are as follows: (1) R$906 from concession contract assets to intangible assets; (2) R$2 from property, plant and equipment to intangible assets; and (3) R$5 from concession financial asset to intangible assets.