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INTANGIBLE ASSETS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]        
Intangible assets R$ 14,621 R$ 12,953 R$ 11,810 R$ 11,624
Temporary Easements Intangible Assets [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 9 10 9 8
Service concession rights [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 4 5 6 7
Assets Of Concession [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 13,555 11,807 11,674 11,517
Assets Of Concession G S F [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 832 966  
Other intangible assets [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 15 4 8 10
Useful Life Defined Intangible Asset [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 14,415 12,792 R$ 11,697 R$ 11,542
Intangible Assets Under Developments [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 206 161    
Gross carrying amount [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 25,172 22,775    
Gross carrying amount [member] | Temporary Easement Intangible Assets [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 15 15    
Gross carrying amount [member] | Service concession rights [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 14 13    
Gross carrying amount [member] | Assets Of Concession [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 23,813 21,476    
Gross carrying amount [member] | Assets Of Concession G S F [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 1,032 1,032    
Gross carrying amount [member] | Other intangible assets [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 92 78    
Gross carrying amount [member] | Useful Life Defined Intangible Asset [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 24,966 22,614    
Gross carrying amount [member] | Intangible Assets Under Developments [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 206 161    
Accumulated depreciation and amortisation [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (10,551) (9,822)    
Accumulated depreciation and amortisation [member] | Temporary Easement Intangible Assets [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (6) (5)    
Accumulated depreciation and amortisation [member] | Service concession rights [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (10) (8)    
Accumulated depreciation and amortisation [member] | Assets Of Concession [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (10,258) (9,669)    
Accumulated depreciation and amortisation [member] | Assets Of Concession G S F [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (200) (66)    
Accumulated depreciation and amortisation [member] | Other intangible assets [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (77) (74)    
Accumulated depreciation and amortisation [member] | Useful Life Defined Intangible Asset [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets R$ (10,551) R$ (9,822)