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35 Financial Instruments (Details 6)
 12 Months Ended
Dec. 31, 2020
Until 2020 [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Indicator Economic - financial efficiency and quality
Criteria 2 consecutive years or at the end of the 5-year period (2020)
Penalties Concession termination
Until 2020 [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Indicator Quality Indicators
Criteria 2 consecutive years or 3 times in 5 years
Penalties Limitation of dividend and interest on equity distribution
Until 2020 [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Indicator Economic - financial efficiency
Criteria in the base year
Penalties Capital Increase (a) Limitation of dividend and interest on equity distribution Restrictive regime for contracts with related parties [1]
From The 6th Year Of (2021) [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Indicator Economic and financial efficiency
Criteria 2 consecutive years
Penalties Concession termination
From The 6th Year Of (2021) [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Indicator Quality Indicators
Criteria 3 consecutive years
Penalties Concession termination
[1] Within 180 days from the end of each fiscal year, in the totality of the insufficiency that occurs to reach the Minimum Economic and Financial Sustainability Parameter.