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Note 27 - Financial Instruments and Risks - Fair Value Hierarchy (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Financial asset at fair value through other comprehensive income R$ 3,778.4 R$ 3,081.8
Financial asset at fair value through profit or loss 13.4 11.9
Derivatives assets at fair value through profit or loss 34.1 100.1
Derivatives - operational hedge 220.8 285.1
Total 4,046.7 3,478.9
Financial liabilities at fair value through profit and loss (i) [1] 2,669.5 5,764.1
Derivatives liabilities at fair value through profit or loss 243.4 16.1
Derivatives liabilities - operational hedge 438.4 201.4
Total 3,351.3 5,981.6
Level 1 of fair value hierarchy [member]    
Statement Line Items [Line Items]    
Financial asset at fair value through other comprehensive income 3,778.4 3,081.8
Financial asset at fair value through profit or loss 13.4 11.9
Derivatives assets at fair value through profit or loss 0.1 0.1
Derivatives - operational hedge 1.6 4.8
Total 3,793.5 3,098.6
Financial liabilities at fair value through profit and loss (i) [1]
Derivatives liabilities at fair value through profit or loss 0.5 1.7
Derivatives liabilities - operational hedge 36.6 58.4
Total 37.1 60.1
Level 2 of fair value hierarchy [member]    
Statement Line Items [Line Items]    
Financial asset at fair value through other comprehensive income
Financial asset at fair value through profit or loss
Derivatives assets at fair value through profit or loss 34.0 100.0
Derivatives - operational hedge 219.2 280.3
Total 253.2 380.3
Financial liabilities at fair value through profit and loss (i) [1]
Derivatives liabilities at fair value through profit or loss 242.9 14.4
Derivatives liabilities - operational hedge 401.8 143.0
Total 644.7 157.4
Level 3 of fair value hierarchy [member]    
Statement Line Items [Line Items]    
Financial asset at fair value through other comprehensive income
Financial asset at fair value through profit or loss
Derivatives assets at fair value through profit or loss
Derivatives - operational hedge
Total
Financial liabilities at fair value through profit and loss (i) [1] 2,669.5 5,764.1
Derivatives liabilities at fair value through profit or loss
Derivatives liabilities - operational hedge
Total R$ 2,669.5 R$ 5,764.1
[1] Refers to the put option granted on subsidiary as described in Note 21 d(4).