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22 Debentures (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Debentures Abstract    
Debentures, beginning balance R$ 7,518,131 R$ 6,070,978
Funding 2,965,028 2,890,283
Charges and monetary variations 623,795 549,539
Amortization - principal (1,977,125) (1,491,667)
Payment - charges (700,119) (501,002)
Debentures, ending balance R$ 8,429,710 R$ 7,518,131