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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, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |
Beginning balance | R$ 47,627.4 | R$ 46,651.3
Share issued, amount | 103.1 |
Final balance | R$ 57,547.4 | R$ 47,627.4
Issued capital [member] |  |
Statement Line Items [Line Items] |  |
Beginning balance, common shares (in shares) | 15,717.6 | 15,717.6
Beginning balance | R$ 57,614.1 | R$ 57,614.1
Share issued, common shares (in shares) | 4.5 |
Share issued, amount | R$ 96.1 |
Final balance, common shares (in shares) | 15,722.1 | 15,717.6
Final balance | R$ 57,710.2 | R$ 57,614.1

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