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27 Insurance (Details)
R$ in Thousands
Dec. 31, 2020
BRL (R$)
Summary of insurance [Line Items]  
Coverage R$ 5,796,130
Specified risks - fire [member]  
Summary of insurance [Line Items]  
Coverage 2,185,827
Engineering risk [member]  
Summary of insurance [Line Items]  
Coverage 2,764,278
Guarantee insurance for escrow deposit [member]  
Summary of insurance [Line Items]  
Coverage 500,000
Traditional guarantee insurance [member]  
Summary of insurance [Line Items]  
Coverage 100,000
Civil liability- d&o (directors and officers) [member]  
Summary of insurance [Line Items]  
Coverage 100,000
Civil liability - works [member]  
Summary of insurance [Line Items]  
Coverage 136,010
Domestic and international transportation [member]  
Summary of insurance [Line Items]  
Coverage 1
Civil liability - operations [member]  
Summary of insurance [Line Items]  
Coverage 10,000
Other insurance coverage [member]  
Summary of insurance [Line Items]  
Coverage R$ 15