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Note 11 - Finance Cost and Income - Finance Income (Details) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Interest income R$ 458.8 R$ 513.6 R$ 575.5
Gains on derivative 73.7 113.5 428.3
Financial assets at fair value through profit or loss 227.6 247.5 261.4
Other financial results 14.3 21.3 29.0
R$ 774.4 R$ 895.9 R$ 1,294.2