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5 Risk management (Details 2)
¥ in Thousands, R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
R$ / $
R$ / ¥
Number
Dec. 31, 2020
USD ($)
R$ / $
R$ / ¥
Number
Dec. 31, 2020
JPY (¥)
R$ / $
R$ / ¥
Number
Dec. 31, 2019
R$ / $
R$ / ¥
USD        
Summary of risk management [Line Items]        
Exchange rate estimated according to the scenario | R$ / $ 5.1967 5.1967 5.1967 4.0307
Yen        
Summary of risk management [Line Items]        
Exchange rate estimated according to the scenario | R$ / ¥ 0.05043 0.05043 0.05043 0.03715
Scenario I (probable) [member]        
Summary of risk management [Line Items]        
Total effect on net financial result in R$ - gain/(loss) | R$ [1] R$ (10,492)      
Scenario I (probable) [member] | USD        
Summary of risk management [Line Items]        
Net currency exposure | $ [1]   $ 167,479    
Currency rate [1] 5.1967 5.1967 5.1967  
Exchange rate estimated according to the scenario [1] 5.0000 5.0000 5.0000  
Differences between the rates [1] 0.1967 0.1967 0.1967  
Effect on net financial result R$ - gain/(loss) | $ [1]   $ 32,943    
Scenario I (probable) [member] | Yen        
Summary of risk management [Line Items]        
Net currency exposure | ¥ [1]     ¥ 52,969,560  
Currency rate [1] 0.05043 0.05043 0.05043  
Exchange rate estimated according to the scenario [1] 0.05125 0.05125 0.05125  
Differences between the rates [1] (0.00082) (0.00082) (0.00082)  
Effect on net financial result R$ - gain/(loss) | ¥ [1]     ¥ (43,435)  
Scenario II (+25%) [member]        
Summary of risk management [Line Items]        
Total effect on net financial result in R$ - gain/(loss) | R$ R$ (898,381)      
Scenario II (+25%) [member] | USD        
Summary of risk management [Line Items]        
Net currency exposure | $   $ 167,479    
Currency rate 5.1967 5.1967 5.1967  
Exchange rate estimated according to the scenario 6.2500 6.2500 6.2500  
Differences between the rates (1.0533) (1.0533) (1.0533)  
Effect on net financial result R$ - gain/(loss) | $   $ (176,406)    
Scenario II (+25%) [member] | Yen        
Summary of risk management [Line Items]        
Net currency exposure | ¥     ¥ 52,969,560  
Currency rate 0.05043 0.05043 0.05043  
Exchange rate estimated according to the scenario 0.06406 0.06406 0.06406  
Differences between the rates (0.01363) (0.01363) (0.01363)  
Effect on net financial result R$ - gain/(loss) | ¥     ¥ (721,975)  
Scenario III (+50%) [member]        
Summary of risk management [Line Items]        
Total effect on net financial result in R$ - gain/(loss) | R$ R$ (1,786,269)      
Scenario III (+50%) [member] | USD        
Summary of risk management [Line Items]        
Net currency exposure | $   $ 167,479    
Currency rate 5.1967 5.1967 5.1967  
Exchange rate estimated according to the scenario 7.5000 7.5000 7.5000  
Differences between the rates (2.3033) (2.3033) (2.3033)  
Effect on net financial result R$ - gain/(loss) | $   $ (385,754)    
Scenario III (+50%) [member] | Yen        
Summary of risk management [Line Items]        
Net currency exposure | ¥     ¥ 52,969,560  
Currency rate 0.05043 0.05043 0.05043  
Exchange rate estimated according to the scenario 0.07687 0.07687 0.07687  
Differences between the rates (0.02644) (0.02644) (0.02644)  
Effect on net financial result R$ - gain/(loss) | ¥     ¥ (1,400,515)  
[1] For the probable scenario in US dollar, the exchange rate estimated for December 31, 2021 was used, pursuant to the BACEN Focus Report of December 31, 2020. For the Yen, the exchange estimated for December 31, 2021 was used, according to B3's Reference Rates report of December 31, 2020.