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Financial Instruments and Risks - Capital Management (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financial Instruments and Risks |  |  |
Loans and financing | R$ 31,074,056 | R$ 12,191,856 | R$ 14,012,779
Debentures | 4,663,453 |  |
Cash and financial investments | (25,486,018) | (2,708,338) |
Net debt | 10,251,491 | 9,483,518 |
Shareholders' equity controlling | 12,012,007 | 11,616,611 | R$ 10,124,989
Shareholders' equity non-controlling | 13,928 |  |
Shareholders' equity and net debt | R$ 22,277,426 | R$ 21,100,129 |

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