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Note 12 - Income Tax and Social Contribution (Details Textual) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |
Total tax expense (income) | R$ 1,789.6 | R$ 5,079.3 | R$ 315.0
CRBS S.A. [member] |  |  |
Statement Line Items [Line Items] |  |  |
Total tax expense (income) |  | 2,926.0 |
Tax expense (income), continuing operations, non-recurring, Federal Tax Amnesty Program |  | 2,785.0 |
Tax expense (income), continuing operations, financial results, Federal Tax Amnesty Program |  | R$ 141.0 |

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