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Intangible Assets - Schedule of Composition of Intangible Assets (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]        
Intangible assets R$ 15,249 R$ 14,621 R$ 12,953 R$ 11,810
Temporary Easements Intangible Assets [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 8 9 10 9
Onerous Concession [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 4 4 5 6
Assets of Concession [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 14,284 13,555 11,807 11,674
Assets of Concession GSF [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 697 832 966  
Other Intangible Assets [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 60 15 4 8
Useful Life Defined Intangible Asset [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 15,053 14,415 R$ 12,792 R$ 11,697
Intangible Assets Under Developments [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 196 206    
Historical Cost [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 26,612 25,172    
Historical Cost [Member] | Temporary Easements Intangible Assets [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 15 15    
Historical Cost [Member] | Onerous Concession [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 14 14    
Historical Cost [Member] | Assets of Concession [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 25,217 23,813    
Historical Cost [Member] | Assets of Concession GSF [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 1,031 1,032    
Historical Cost [Member] | Other Intangible Assets [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 139 92    
Historical Cost [Member] | Useful Life Defined Intangible Asset [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 26,416 24,966    
Historical Cost [Member] | Intangible Assets Under Developments [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets 196 206    
Accumulated depreciation and amortisation [member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (11,363) (10,551)    
Accumulated depreciation and amortisation [member] | Temporary Easements Intangible Assets [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (7) (6)    
Accumulated depreciation and amortisation [member] | Onerous Concession [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (10) (10)    
Accumulated depreciation and amortisation [member] | Assets of Concession [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (10,933) (10,258)    
Accumulated depreciation and amortisation [member] | Assets of Concession GSF [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (334) (200)    
Accumulated depreciation and amortisation [member] | Other Intangible Assets [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets (79) (77)    
Accumulated depreciation and amortisation [member] | Useful Life Defined Intangible Asset [Member]        
IfrsStatementLineItems [Line Items]        
Intangible assets R$ (11,363) R$ (10,551)