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Schedule of Deferred income tax and social contribution (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning R$ 2,268,280  
Noncurrent assets, recognized in income (3,955)  
Noncurrent assets, reclassification 17,116 R$ (81,971)
Noncurrent assets, ending   2,268,280
Noncurrent assets, recognized comprehensive income   92,190
Noncurrent liabilities, others (146,943)  
Noncurrent assets, beginning   2,268,280
[custom:DeferredIncomeTaxAndSocialContributionNoncurrentAssets1-1]   2,068,337
[custom:DeferredIncomeTaxAndSocialContributionNoncurrentAssetsRecognizedInIncome1]   189,724
[custom:DeferredIncomeTaxAndSocialContributionNoncurrentAssetsRecognizedInOtherComprehensiveIncome1] (93,881)  
[custom:DeferredIncomeTaxAndSocialContributionNoncurrentAssets1-2] 2,040,617  
Noncurrent liabilities, beginning 1,561,514 1,350,137
Noncurrent liabilities, recognized in income 786,451 214,620
Noncurrent liabilities, ending 2,442,186 1,561,514
[custom:NoncurrentLiabilitiesEffectsOfApplyingNewIfrs]   (3,243)
[custom:NoncurrentLiabilitiesOthers] 94,221  
Net, beginning 706,766 718,200
Net, recognized in income (790,406) (24,896)
Net, reclassification 17,116 (78,728)
Net, recognized comprehensive income   92,190
Net, Others (241,164)  
Net, ending (401,569) 706,766
Assets presented in the Statement of Financial Position 1,191,104 1,011,866
Assets presented in the Statement of Financial Position 963,259 1,191,104
Liabilities presented in the Statement of Financial Position (484,338) (293,666)
Liabilities presented in the Statement of Financial Position (1,364,828) (484,338)
Discontinued operation 148,005  
Consolidation of Vilas 94,221  
Reclassification to Assets held for sale 17,116  
Legal proceedings provision [member]    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 499,375 516,752
Noncurrent assets, recognized in income 7,291 (4,391)
Noncurrent assets, reclassification (2,205) (12,986)
Noncurrent assets, ending 504,461 499,375
Noncurrent assets, beginning 504,461 499,375
Post Employment Benefits [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 507,032 405,414
Noncurrent assets, recognized in income (766) 7,845
Noncurrent assets, reclassification 16,875 1,583
Noncurrent assets, ending 429,260 507,032
Noncurrent assets, recognized comprehensive income (93,881) 92,190
Noncurrent assets, beginning 429,260 507,032
Impairment Of Assets [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 310,606 385,467
Noncurrent assets, recognized in income (6,456) (45,146)
Noncurrent assets, reclassification (1,753) (29,715)
Noncurrent assets, ending 302,397 310,606
Noncurrent assets, beginning 302,397 310,606
Research and development and energy efficiency programs    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 152,498 165,331
Noncurrent assets, recognized in income (13,649) (12,833)
Noncurrent assets, ending 138,849 152,498
Noncurrent assets, beginning 138,849 152,498
Tax losses and negative tax basis    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 215,389 98,242
Noncurrent assets, recognized in income 54,416 146,469
Noncurrent assets, reclassification 1,210 (29,322)
Noncurrent assets, ending 123,010 215,389
Noncurrent liabilities, others (148,005)  
Noncurrent assets, beginning 123,010 215,389
Provision For Performance And Profit Sharing [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 160,459 52,115
Noncurrent assets, recognized in income (45,866) 108,344
Noncurrent assets, ending 114,593 160,459
Noncurrent assets, beginning 114,593 160,459
Allowance for doubtful accounts    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 123,182 131,821
Noncurrent assets, recognized in income (21,476) (6,889)
Noncurrent assets, reclassification (2,994) (1,750)
Noncurrent assets, ending 98,712 123,182
Noncurrent assets, beginning 98,712 123,182
Social Security Contributions Injunction On Judicial Deposit [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 70,992 71,200
Noncurrent assets, recognized in income 3,673 2,745
Noncurrent assets, reclassification 78 (2,953)
Noncurrent assets, ending 74,743 70,992
Noncurrent assets, beginning 74,743 70,992
Amortization - concession    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 47,209 58,344
Noncurrent assets, recognized in income 5,220 (11,135)
Noncurrent assets, ending 52,429 47,209
Noncurrent assets, beginning 52,429 47,209
Voluntary Retirement Program [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 10,815 958
Noncurrent assets, recognized in income 13,493 9,857
Noncurrent assets, ending 24,308 10,815
Noncurrent assets, beginning 24,308 10,815
Concession Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 21,061 22,353
Noncurrent assets, recognized in income (1,292) (1,292)
Noncurrent assets, ending 19,769 21,061
Noncurrent liabilities, others 94,221  
Noncurrent assets, beginning 19,769 21,061
Noncurrent liabilities, beginning 900,505 711,831
Noncurrent liabilities, recognized in income 808,372 188,674
Noncurrent liabilities, ending 1,803,098 900,505
Other [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent assets, beginning 149,662 160,340
Noncurrent assets, recognized in income 1,457 (3,850)
Noncurrent assets, reclassification 5,905 (6,828)
Noncurrent assets, ending 158,086 149,662
Noncurrent liabilities, others 1,062  
Noncurrent assets, beginning 158,086 149,662
Noncurrent liabilities, beginning 31,951 42,577
Noncurrent liabilities, recognized in income (20,343) (10,626)
Noncurrent liabilities, ending 11,608 31,951
Deemed Cost Of Property Plant And Equipment [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent liabilities, beginning 350,491 381,209
Noncurrent liabilities, recognized in income (23,994) (30,718)
Noncurrent liabilities, ending 326,497 350,491
Financial Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent liabilities, beginning 117,682 70,945
Noncurrent liabilities, recognized in income (12,178) 46,737
Noncurrent liabilities, ending 105,504 117,682
Accelerated Depreciation [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent liabilities, beginning 75,955 50,322
Noncurrent liabilities, recognized in income 26,369 25,633
Noncurrent liabilities, ending 102,324 75,955
Escrow Deposits Monetary Variation [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent liabilities, beginning 61,727 61,145
Noncurrent liabilities, recognized in income 3,392 1,787
Noncurrent liabilities, ending 65,119 61,727
[custom:NoncurrentLiabilitiesEffectsOfApplyingNewIfrs]   (1,205)
Transaction Cost On Borrowings And Debentures [Member]    
IfrsStatementLineItems [Line Items]    
Noncurrent liabilities, beginning 23,203 32,108
Noncurrent liabilities, recognized in income 4,833 (6,867)
Noncurrent liabilities, ending R$ 28,036 23,203
[custom:NoncurrentLiabilitiesEffectsOfApplyingNewIfrs]   R$ (2,038)