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Note 21 - Changes in Equity - Net Income Reserves (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Line Items [Line Items] |  |  |
Balance | R$ 46,651.3 | R$ 50,333.7 | R$ 43,644.7
Interest on own capital | (4,869.7) | (5,493.4) | (6,846.1)
Fiscal incentive reserve |  |  |
Investments reserve |  |  |
Balance | 47,982.8 | 46,651.3 | 50,333.7
Net income reserves, investment reserve [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance | 3,859.9 | 2,141.2 |
Interest on own capital | (3,770.1) |  |
Destination of net income |  | 1,718.6 |
Fiscal incentive reserve |  |  |
Investments reserve | 1,177.9 |  |
Balance | 1,267.7 | 3,859.9 | 2,141.2
Net income reserves, statutory reserve [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance | 4.5 | 4.5 |
Interest on own capital |  |  |
Destination of net income |  |  |
Fiscal incentive reserve |  |  |
Investments reserve |  |  |
Balance | 4.5 | 4.5 | 4.5
Net income reserves, fiscal incentive [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance | 5,835.7 | 4,016.2 |
Interest on own capital |  |  |
Destination of net income |  | 1,819.5 |
Fiscal incentive reserve | 1,552.3 |  |
Investments reserve |  |  |
Balance | 7,388.0 | 5,835.7 | 4,016.2
Net income reserves, interest on capital and dividends proposed [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance |  | 2,039.2 |
Interest on own capital |  | (2,039.2) |
Destination of net income |  |  |
Fiscal incentive reserve |  |  |
Investments reserve |  |  |
Balance |  |  | 2,039.2
Net income reserves [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance | 9,700.1 | 8,201.2 | 4,883.8
Interest on own capital | (3,770.1) | (2,039.2) | (1,979.8)
Destination of net income |  | 3,538.1 |
Fiscal incentive reserve | 1,552.3 | 1,819.5 | 1,143.6
Investments reserve | 1,177.9 | 1,718.6 | 2,114.4
Balance | R$ 8,660.2 | R$ 9,700.1 | R$ 8,201.2

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