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Financial Instruments and Risks Management - Derivative Fair value by maturity schedule (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | R$ (1,818,941) | R$ (1,142,766)
Not later than one year |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (633,644) | (244,069)
Later than one year and not later than two years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | 98,850 | (180,333)
Later than two years and not later than three years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (154,734) | 87,851
Later than three years and not later than four years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | 185,209 | 83,692
Later than four years and not later than five years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (197,718) | 80,052
Later than five years and not later than six years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (606,827) | 82,963
Later than six years and not later than seven years [Member] |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net |  | (486,958)
later than six years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | R$ (510,077) |
Later than seven years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net |  | R$ (565,964)

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