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35 Financial Instruments (Details 11) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Less: Cash and cash equivalents | R$ 3,222,768 | R$ 2,941,727 |  |
Net debt | 3,188,531 | 3,142,383 |  |
Equity | 20,250,518 | 17,598,212 | R$ 16,336,214 | R$ 15,345,579
Capital Management Risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Loans and financing | 3,188,531 | 3,142,383 |  |
Debentures | 6,757,481 | 8,429,710 |  |
Less: Cash and cash equivalents | 3,222,768 | 2,941,727 |  |
Less: Bonds and securities | 1,465 | 3,112 |  |
Capital Management Risk [member] | Indebtedness [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Loans and financing | 3,214,249 | 3,168,710 |  |
Debentures | 6,837,819 | 8,540,366 |  |
Less: Cash and cash equivalents | 3,222,768 | 2,941,727 |  |
Less: Bonds and securities | 300,530 | 282,081 |  |
Net debt | 6,528,770 | 8,485,268 |  |
Equity | R$ 20,250,518 | R$ 17,598,212 |  |
Debit to equity ratio (in R$ per share) | R$ 0.32 | R$ 0.48 |  |

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