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Schedule of other intangible assets (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning R$ 6,929,456    
Loss on disposal (30,623) R$ (52,811) R$ (26,368)
Reclassification [1] (20,366) (657,590)  
Intangible assets, ending 9,215,560 6,929,456  
Other In Service [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 19,209 31,620  
Acquisitions   128  
Transfers from property, plant and equipment 986 229  
Capitalizations for intangible in service 4,453 7,136  
Amortization of quotas - concession and authorization (7,770) (11,584)  
Amortization of quotas - PIS/Pasep and Cofins credits (5) (13)  
Reclassification 141 (8,307)  
Effect of acquisition of control of Vilas Complex 10,275    
Acquisitions    
Partial division of assets (5,047)    
Intangible assets, ending 22,242 19,209 31,620
Other In Progress [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 20,654 14,634  
Acquisitions   10,863  
Transfers from property, plant and equipment 482 2,932  
Capitalizations for intangible in service (4,453) (7,136)  
Loss on disposal   (4)  
Reclassification 599 (635)  
Acquisitions 10,375    
Partial division of assets (526)    
Intangible assets, ending 27,131 20,654 14,634
Other [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 39,863 46,254  
Acquisitions   10,991  
Transfers from property, plant and equipment 1,468 3,161  
Amortization of quotas - concession and authorization (7,770) (11,584)  
Amortization of quotas - PIS/Pasep and Cofins credits (5) (13)  
Loss on disposal   (4)  
Reclassification 740 (8,942)  
Effect of acquisition of control of Vilas Complex 10,275    
Acquisitions 10,375    
Partial division of assets (5,573)    
Intangible assets, ending R$ 49,373 R$ 39,863 R$ 46,254
[1] The variation in provisions for legal claims occurred due to the review of the assessment of the Company’s legal advisors, mainly in civil claims. The details of the actions are shown in Note 30.