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23. Debentures (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debentures Details 2Abstract    
Debentures, beginning R$ 6,070,978 R$ 4,790,809
Funding 2,890,283 2,242,521
Charges and monetary variations 549,539 575,468
Amortization - principal (1,491,667) (915,005)
Payment - charges (501,002) (622,815)
Debentures, ending R$ 7,518,131 R$ 6,070,978