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11 BORROWINGS, FINANCING AND DEBENTURES (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about borrowings [line items] |  |  |
Raised | R$ 10,149,381 |  |
Amortization of principal | (11,775,093) |  |
Amortization of charges | (2,039,112) | R$ (2,141,710) | R$ (2,634,931)
Prepayment [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Raised | 805,288 |  |
Amortization of principal | (1,596,711) |  |
Amortization of charges | (319,257) |  |
Bonds, Perpetual Bonds, ACC and Facility [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Raised | 6,616,544 |  |
Amortization of principal | (5,959,029) |  |
Amortization of charges | (882,007) |  |
BNDES/FINAME, Debentures, NCE and CCB [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Raised | 2,727,549 |  |
Amortization of principal | (4,219,353) |  |
Amortization of charges | R$ (837,848) |  |

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