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Note 21 - Changes in Equity - Net Income Reserves (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |
Beginning balance | R$ 47,627.4 | R$ 46,651.3 | R$ 50,333.7
Interest on shareholder´s equity | (5,030.5) | (4,869.7) | (5,493.4)
Fiscal incentive reserve |  |  |
Investments reserve |  |  |
Final balance | 57,547.4 | 47,627.4 | 46,651.3
Net income reserves, investment reserve [member] |  |  |
Statement Line Items [Line Items] |  |  |
Beginning balance | 1,267.7 | 3,859.9 |
Interest on shareholder´s equity |  | (3,770.1) |
Fiscal incentive reserve |  |  |
Investments reserve | 5,442.3 | 1,177.9 |
Final balance | 6,710.0 | 1,267.7 | 3,859.9
Net income reserves, statutory reserve [member] |  |  |
Statement Line Items [Line Items] |  |  |
Beginning balance | 4.5 | 4.5 |
Interest on shareholder´s equity |  |  |
Fiscal incentive reserve |  |  |
Investments reserve |  |  |
Final balance | 4.5 | 4.5 | 4.5
Net income reserves, fiscal incentive [member] |  |  |
Statement Line Items [Line Items] |  |  |
Beginning balance | 7,388.0 | 5,835.7 |
Interest on shareholder´s equity |  |  |
Fiscal incentive reserve | 1,331.5 | 1,552.3 |
Investments reserve |  |  |
Final balance | 8,719.5 | 7,388.0 | 5,835.7
Net income reserves, interest on capital and dividends proposed [member] |  |  |
Statement Line Items [Line Items] |  |  |
Beginning balance | 8,660.2 | 9,700.1 |
Interest on shareholder´s equity |  | (3,770.1) |
Fiscal incentive reserve | 1,331.5 | 1,552.3 |
Investments reserve | 5,442.3 | 1,177.9 |
Final balance | R$ 15,434.0 | R$ 8,660.2 | R$ 9,700.1

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