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Note 30 - Contingent Liability - Estimates of Amounts of Possible Losses (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Estimates of amounts of possible losses R$ 72,055.5 R$ 60,520.0
Income tax and social contribution [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 37,867.4 31,757.3
Value added and excise taxes [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 23,891.4 19,805.5
PIS and COFINS tax contingent liability [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 4,386.3 3,485.2
Labor contingent liability [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 353.4 287.1
Civil proceedings contingent liability [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses 4,385.7 4,071.5
Other contingent liabilities [member]    
Statement Line Items [Line Items]    
Estimates of amounts of possible losses R$ 1,171.3 R$ 1,113.4