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Contract assets (Details 2) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Contract assets, beginning R$ 7,672,679  
Contract assets, ending 7,605,061 R$ 7,672,679
Piped Gas Distribution Service Concession [Member]    
IfrsStatementLineItems [Line Items]    
Contract assets, beginning 30,032 29,815
Acquisitions 25,510 13,955
Transfers to intangible assets (11,503) (13,738)
Reclassification (44,039)  
Contract assets, ending R$ 30,032