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Note 27 - Financial Instruments and Risks - Fair Value Hierarchy (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Financial asset at fair value through profit or loss R$ 11.9 R$ 282.8
Derivatives assets at fair value through profit or loss 100.1 18.4
Derivatives - operational hedge 285.1 194.5
397.1 495.7
Financial liabilities at fair value through profit and loss (i) [1] 5,764.1 5,106.1
Derivatives liabilities at fair value through profit or loss 16.1 49.9
Derivatives liabilities - operational hedge 201.4 654.8
Derivatives liabilities - fair value hedge 8.7
5,981.6 5,819.5
Level 1 of fair value hierarchy [member]    
Statement Line Items [Line Items]    
Financial asset at fair value through profit or loss 11.9 282.8
Derivatives assets at fair value through profit or loss 0.1 2.6
Derivatives - operational hedge 4.8 83.6
16.8 369.0
Financial liabilities at fair value through profit and loss (i) [1]
Derivatives liabilities at fair value through profit or loss 1.7 9.9
Derivatives liabilities - operational hedge 58.4 78.9
Derivatives liabilities - fair value hedge
60.1 88.8
Level 2 of fair value hierarchy [member]    
Statement Line Items [Line Items]    
Financial asset at fair value through profit or loss
Derivatives assets at fair value through profit or loss 100.0 15.8
Derivatives - operational hedge 280.3 110.9
380.3 126.7
Financial liabilities at fair value through profit and loss (i) [1]
Derivatives liabilities at fair value through profit or loss 14.4 40.0
Derivatives liabilities - operational hedge 143.0 575.9
Derivatives liabilities - fair value hedge 8.7
157.4 624.6
Level 3 of fair value hierarchy [member]    
Statement Line Items [Line Items]    
Financial asset at fair value through profit or loss
Derivatives assets at fair value through profit or loss
Derivatives - operational hedge
Financial liabilities at fair value through profit and loss (i) [1] 5,764.1 5,106.1
Derivatives liabilities at fair value through profit or loss
Derivatives liabilities - operational hedge
Derivatives liabilities - fair value hedge
R$ 5,764.1 R$ 5,106.1
[1] Refers to the put option granted on subsidiary as described in Note 21 d(4).