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Note 30 - Contingent Liability - Estimates of Amounts of Possible Losses (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Estimates of amounts of possible losses R$ 60,520.0 R$ 52,450.5
IRPJ and CSLL tax contingent liability [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 31,757.3 28,934.8
PIS and COFINS tax contingent liability [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 3,485.2 1,971.1
ICMS and IPI contingent liability [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 19,805.5 16,046.9
Labor contingent liability [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 287.1 222.0
Legal proceedings contingent liability [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 4,071.5 4,417.6
Other contingent liabilities [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses R$ 1,113.4 R$ 858.1