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Schedule of derivative financial instruments used to hedge the exposure to interest rates (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]  
Notional R$ 3,300,000
Fair value (30,108)
Object R$ 164,474 [1]
Cash Flow Hedges Derivative Instruments 1 [Member]  
IfrsStatementLineItems [Line Items]  
Hedged object  Debenture - 1st Issue - 3rd series - IPCA + 5.50% p.a. 
Maturity  2nd Qtr. 2026 
Assets IPCA + 5.50% p.a.
Liabilities  CDI + 0.57% p.a. 
Notional R$ 200,000
Fair value 1,863
Object R$ (1,179) [1]
Cash Flow Hedges Derivative Instruments 2 [Member]  
IfrsStatementLineItems [Line Items]  
Hedged object  Debenture - 2nd Issue - 1st series - IPCA + 5.30% p.a. 
Maturity  3rd Qtr. 2027 
Assets IPCA + 5.30% p.a.
Liabilities  CDI + 2.16% p.a. 
Notional R$ 705,000
Fair value (3,204)
Object R$ 46,560 [1]
Cash Flow Hedges Derivative Instruments 3 [Member]  
IfrsStatementLineItems [Line Items]  
Hedged object  Debenture - 2nd Issue - 2nd series - IPCA + 5.60% p.a. 
Maturity  3rd Qtr. 2030 
Assets IPCA + 5.60% p.a.
Liabilities  CDI + 2.29% p.a. 
Notional R$ 1,495,000
Fair value (34,368)
Object R$ 112,240 [1]
Cash Flow Hedges Derivative Instruments 4 [Member]  
IfrsStatementLineItems [Line Items]  
Hedged object  Debenture - 3rd Issue - single series - IPCA + 4.78% p.a. 
Maturity  2nd Qtr. 2031 
Assets IPCA + 4.78% p.a.
Liabilities  CDI + 0.20% p.a. 
Notional R$ 900,000
Fair value 5,601
Object R$ 6,853 [1]
[1] Corresponds to the accumulated amount of fair value hedge adjustments on the hedged items, included in the carrying amount of the debentures.