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Schedule of financial income and expenses (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income from financial investments R$ 242 R$ 95 R$ 102
Interest on sale of energy 460 399 361
Monetary variations 68 42 30
Monetary variations – CVA (Note 14) 64 32 105
Monetary updating of escrow deposits 29 53 50
PIS/Pasep and Cofins charged on finance income [1] (124) (96) (128)
Gains on financial instruments –swap (Note 31) 1,753 998
Borrowing costs paid by related parties 2 30 48
Monetary updating on PIS/Pasep and Cofins taxes credits over ICMS (Note 9) [2] 20 42 1,580
Others 83 95 61
 Finance income 844 2,445 3,207
FINANCE EXPENSES      
Charges on loans and financings (Note 22) 1,147 1,178 1,227
Cost of debt – amortization of transaction cost (Note 22) 20 15 38
Foreign exchange variations - loans and financing (Note 22) 353 1,742 226
Premium on repurchase of debt securities (Eurobonds) (Note 22) (491)
Foreign exchange variations – Itaipu 27 47 13
Monetary updating – loans and financings (Note 22) 331 187 142
Monetary updating – onerous concessions 8 9 3
Charges and monetary updating on post-employment obligations (Note 24) 70 53 56
Loss on financial instruments –swap (Note 31) (538)
Monetary updating – Lease liabilities (Note 19) (25) (27) (34)
Others 86 92 108
 Finance costs (3,096) (3,350) (1,847)
NET FINANCE INCOME (EXPENSES) R$ (2,252) R$ (905) R$ 1,360
[1] The PIS/Pasep and Cofins expenses apply to Interest on Equity.
[2] The updating of the tax credits for the court judgment on PIS, Pasep, Cofins / ICMS tax, and the related liability to be refunded to customers, is presented at net value.