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Indicators and penalties (Details)
 12 Months Ended
Dec. 31, 2021
Unti Twenty Twenty [Member]  
IfrsStatementLineItems [Line Items]  
Criteria Economic - financial efficiency and quality
Criteria 2 consecutive years or at the end of the 5-year period (2020)
Penalties Concession termination
Unti Twenty Twenty One [Member]  
IfrsStatementLineItems [Line Items]  
Criteria Quality Indicators
Criteria 2 consecutive years or 3 times in 5 years
Penalties Limitation of dividend and interest on equity distribution
Unti Twenty Twenty Two [Member]  
IfrsStatementLineItems [Line Items]  
Criteria Economic - financial efficiency
Criteria in the base year
Until Twenty Twenty Two 1 [Member]  
IfrsStatementLineItems [Line Items]  
Penalties Capital Increase (a)
Until Twenty Twenty Two 2 [Member]  
IfrsStatementLineItems [Line Items]  
Penalties Limitation of dividend and interest on equity distribution
Until Twenty Twenty Two 3 [Member]  
IfrsStatementLineItems [Line Items]  
Penalties Restrictive regime for contracts with related parties
Unti Twenty Twenty Three [Member]  
IfrsStatementLineItems [Line Items]  
Criteria Economic - financial efficiency
Criteria 2 consecutive years
Penalties Concession termination
Unti Twenty Twenty Four [Member]  
IfrsStatementLineItems [Line Items]  
Criteria Quality Indicators
Criteria 3 consecutive years