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Note 8 - Exceptional Items - Exceptional Items Included in the Income Statement (Details) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Result through exchange transaction of shareholdings(i) R$ 1,240.0
Restructuring (105.5) (79.8) (63.3)
Administrative lawsuit (239.2)
Costs arising from business combinations (3.8) (29.8) (48.9)
Others 0.6 3.9 (5.8)
R$ (108.7) R$ 1,134.3 R$ (357.2)