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Note 21 - Changes in Equity - Capital Stock (Details) - BRL (R$) shares in Millions, R$ 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
Capital increase |  |  | 9.1
Balance | R$ 47,982.8 | R$ 46,651.3 | 50,333.7
Issued capital [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance, common shares (in shares) | 15,717.6 | 15,717.6 |
Balance | R$ 57,614.1 | R$ 57,614.1 | 57,582.4
Share issued, common shares (in shares) |  |  |
Capital increase |  |  | R$ 31.7
Balance, common shares (in shares) | 15,717.6 | 15,717.6 | 15,717.6
Balance | R$ 57,614.1 | R$ 57,614.1 | R$ 57,614.1

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