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Disclosure - Property, plant and equipment, intangible assets, goodwill, right-of-use assets and contract assets - Summary of transaction charts of contract asset (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of property plant and equipment intangible assets goodwill right of use assets and contract assets [line items]    
Beginning of period R$ 695,938 R$ 600,541
Additions 1,057,379 886,202
Disposals (25,439)
Transfer to concession rights and customer relationships (1,021,896) (790,805)
End of period 705,982 695,938
Gas and Power [member]    
Disclosure of property plant and equipment intangible assets goodwill right of use assets and contract assets [line items]    
Beginning of period 686,690 594,601
Additions 1,020,176 885,631
Disposals
Transfer to concession rights and customer relationships (1,021,896) (793,542)
End of period 684,970 686,690
Moove [member]    
Disclosure of property plant and equipment intangible assets goodwill right of use assets and contract assets [line items]    
Beginning of period 9,248 5,940
Additions 37,203 571
Disposals (25,439)
Transfer to concession rights and customer relationships (2,737)
End of period R$ 21,012 R$ 9,248