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Note 21 - Changes in Equity - Interest on Shareholders' Equity/Dividends (Details) - BRL (R$) R$ / shares in Units, R$ in Millions |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2018 | Dec. 28, 2017 | Jul. 17, 2017 | Feb. 23, 2017 | Dec. 29, 2016 | Nov. 25, 2016 | Jul. 29, 2016 | Feb. 29, 2016 | Dec. 30, 2015 | Sep. 28, 2015 | Jun. 29, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount per share, dividends (in BRL per share) |  |  |  |  | R$ 0.16 | R$ 0.07 |  | R$ 0.16 | R$ 0.13 |  |  |  | R$ 0.15 |  |  |  |  |
Total amount of dividends |  |  |  |  | R$ 2,513.1 | R$ 1,099.1 |  | R$ 2,511.9 | R$ 2,040.8 |  |  |  | R$ 2,352.4 |  |  |  |  |
Amount per share, interest on shareholder´s equity (in BRL per share) |  |  | R$ 0.31 |  |  |  | R$ 0.22 |  |  | R$ 0.13 |  | R$ 0.15 |  | R$ 0.10 |  |  |  |
Dividends recognised as distributions to owners |  |  | R$ 4,869.7 | [1] |  |  | R$ 3,454.2 |  |  | R$ 2,039.2 | [2] | R$ 2,352.7 |  | R$ 1,570.6 |  | R$ 4,044.0 | R$ 6,007.3 | R$ 2,612.8
Total amount of dividends and interest on shareholder´s equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R$ 8,482.5 | R$ 11,145.2 | R$ 7,690.2
Potential ordinary share transactions [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount per share, dividends (in BRL per share) |  | R$ 0.07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount of dividends |  | R$ 1,099.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends 1 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount per share, interest on shareholder´s equity (in BRL per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R$ 0.03 |  |  |
Dividends recognised as distributions to owners | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  | R$ 471.5 |  |  |
Dividends 2 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount per share, interest on shareholder´s equity (in BRL per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R$ 0.06 |  |  |
Dividends recognised as distributions to owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R$ 943.0 |  |  |
[1] | R$3,770.1 of these interest on shareholder's equity refer to the total amount approved for distribution in the period, and were accrued in investments reserves.
[2] | These dividends refer to the total amount approved for distribution in the period, and were accrued in investments reserves.

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