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Intangible Assets - Schedule of Changes in Intangible Assets (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Beginning balance R$ 15,249 R$ 14,621 R$ 12,953
Additions 248 187 119
Disposals (62) (94) (57)
Amotization (1,146) (1,055) (956)
Transfers 2,517 1,590 2,562
Ending balance 16,806 15,249 14,621
Intangible Assets under Development [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 196 206 161
Additions 214 158 106
Disposals (3)
Amotization
Transfers 90 165 61
Ending balance 320 196 206
Temporary Easements Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 8 9 10
Additions
Disposals
Amotization (1) (1) (1)
Transfers [1] [2] [3]
Ending balance 7 8 9
Onerous Concession [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 4 4 5
Additions
Disposals
Amotization (1) (1)
Transfers
Ending balance 3 4 4
Assets of Concession [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 14,284 13,555 11,807
Additions 24 3
Disposals (62) (81) (57)
Amotization (1,000) (914) (817)
Transfers 2,582 1,721 2,622
Ending balance 15,828 14,284 13,555
Assets of Concession GSF [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 697 832 966
Additions
Disposals
Amotization (133) (135) (134)
Transfers
Ending balance 564 697 832
Other Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 60 15 4
Additions 10 26 13
Disposals (10)
Amotization (11) (5) (3)
Transfers 25 34 1
Ending balance 84 60 15
Useful Life Defined Intangible Asset [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 15,053 14,415 12,792
Additions 34 29 13
Disposals (62) (91) (57)
Amotization (1,146) (1,055) (956)
Transfers 2,607 1,755 2,623
Ending balance R$ 16,486 R$ 15,053 R$ 14,415
[1]

The transfers were made between concession contract assets to Intangible assets: in 2024 of R$2,517 (R$1,590 in 2023).
[2]

The transfers were made between concession contract assets to Intangible assets: R$1,590 in 2023 (R$2,448 in 2022).
[3] The main transfers were made between concession contract assets to Intangible assets: in 2022 of R$2,448.