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13. BORROWINGS AND FINANCING (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
BorrowingsAndFinancingLineItems [Line Items] |  |  |
New debts | R$ 8,116,247 | R$ 10,149,381 |
Repayment | (6,448,658) | (11,775,093) | R$ (5,019,978)
Interest payment | (1,922,130) | R$ (2,039,112) |
Prepayment [member] |  |  |
BorrowingsAndFinancingLineItems [Line Items] |  |  |
New debts | 177,420 |  |
Repayment | (1,028,606) |  |
Interest payment | (245,125) |  |
Bonds, Perpetual Bonds, ACC and Facility [member] |  |  |
BorrowingsAndFinancingLineItems [Line Items] |  |  |
New debts | 7,917,929 |  |
Repayment | (4,458,888) |  |
Interest payment | (1,237,396) |  |
BNDES/FINAME, Debentures, NCE and CCB [member] |  |  |
BorrowingsAndFinancingLineItems [Line Items] |  |  |
New debts | 20,898 |  |
Repayment | (961,164) |  |
Interest payment | R$ (439,609) |  |

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