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Note 27 - Financial Instruments and Risks - Reconciliation of Changes in the Categorization of Level 3 (Details)
R$ in Millions
12 Months Ended
Dec. 31, 2017
BRL (R$)
Statement Line Items [Line Items]  
Financial liabilities at December 31, 2016 (i) R$ 24,423.9
Financial liabilities at December 31, 2017 (i) 22,036.6
Level 3 of fair value hierarchy [member]  
Statement Line Items [Line Items]  
Financial liabilities at December 31, 2016 (i) 5,106.1 [1]
Acquisition of investments 7.4
Total gains and losses in the year 650.6
Losses recognized in net income 359.1
Losses recognized in equity 291.5
Financial liabilities at December 31, 2017 (i) R$ 5,764.1 [1]
[1] The liability was recorded under "Trade payables and put option granted on subsidiary and other liabilities" on the balance sheet.