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8 CRC Transferred to the Parana State Government (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
CRC Transferred To Parana State Government [Abstract]    
Changes in CRC, beginning R$ 1,350,685 R$ 1,445,042
Interest 80,788 87,710
Monetary variations 261,176 96,519
Amortizations (300,025) (278,586)
Changes in CRC, ending 1,392,624 1,350,685
Changes in CRC, current 287,789 219,236
Changes in CRC, noncurrent R$ 1,104,835 R$ 1,131,449