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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