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30 Financial Income (Expenses) (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of financial income expense [Line Items] |  |  |  |
Financial expenses |  | R$ (1,324,759) | R$ (1,173,425) | R$ (807,967)
Financial income |  | 336,731 | 372,842 | 446,302
Financial income (expenses), net before exchange rate changes |  | (988,028) | (800,583) | (361,665)
Exchange rate changes, net |  | (2,178,343) | (233,098) | (902,671)
Financial income (expenses), net |  | (3,166,371) | (1,033,681) | (1,264,336)
Inflation adjustment gains [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial income |  | 120,957 | 91,180 | 105,952
Exchange rate changes on assets [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Exchange rate changes, net |  | 1,894 | 863 | 13,235
Other exchange rate changes [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Exchange rate changes, net |  | 4 | (1) | (9)
Interest and charges on borrowings and financing - local currency [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial expenses |  | (348,050) | (331,367) | (332,149)
Interest and charges on borrowings and financing - foreign currency [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial expenses |  | (136,257) | (165,421) | (171,686)
Other financial expenses [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial expenses |  | (328,413) | (344,508) | (187,563)
Income tax over international remittance [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial expenses |  | (15,134) | (17,650) | (19,779)
Inflation adjustment on borrowings and financing [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial expenses |  | (86,938) | (44,802) | (66,183)
Other inflation adjustments [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial expenses |  | (142,313) | (107,584) | (45,193)
Interest and inflation adjustments on provisions [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial expenses | [1] | (267,654) | (162,093) | 14,586
Exchange rate changes on borrowings and financing [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Exchange rate changes, net | [2] | (2,180,241) | (233,960) | (915,897)
Other Financial Income [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial income |  | 4 | 14 | 10
Cofins and Pasep [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial income |  | (22,328) | (20,028) | (22,693)
Interest income [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial income |  | 162,576 | 150,054 | 175,939
Income on financial investments [member] |  |  |  |
Summary of financial income expense [Line Items] |  |  |  |
Financial income |  | R$ 75,522 | R$ 151,622 | R$ 187,094
[1] | Increase of R$ 105.6 million, due to the increase in interest and monetary variations on lawsuits.
[2] | Increase of R$ 1,946.3 million, due to the higher appreciation of the U.S. dollar and the Yen against the Real in 2020 (28.9% and 35.8%, respectively), compared to appreciation presented in 2019 (4.0% and 5.3%, respectively).

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