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Note 12 - Income Tax and Social Contribution (Details Textual) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Interest on net equity, deductible and to be deductible R$ 4,869.8    
Deductible Interest on net equity 4,850.1    
Tax impact of deductible interest in net equity 1,649.0    
Unused provision reversed, other provisions 145.0 R$ 5.0  
Total tax expense (income) 5,079.3 R$ 315.0 R$ 3,634.2
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