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8 CRC Transferred to the Parana State Government (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
CRC Transferred To Parana State Government [Abstract]    
Changes in CRC, beginning R$ 1,445,042 R$ 1,516,362
Interest 87,710 93,009
Monetary variations 96,519 95,788
Amortizations (278,586) (260,117)
Changes in CRC, ending 1,350,685 1,445,042
Changes in CRC, current 219,236 190,876
Changes in CRC, noncurrent R$ 1,131,449 R$ 1,254,166