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Note 27 - Financial Instruments and Risks - Financial Instruments Recognized in the Financial Statements (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financial assets    
Financial asset R$ 18,378.6 R$ 15,439.3
Financial liabilities    
Financial liability 22,036.6 24,423.9
Trade payables and put option granted on subsidiary and other liabilities [member]    
Financial liabilities    
Financial liability 19,266.1 18,314.2
Financial liabilities, derivatives [member]    
Financial liabilities    
Financial liability 217.5 713.4
Interest-bearing loans and borrowings [member]    
Financial liabilities    
Financial liability 2,553.0 5,396.3
Financial liabilities at fair value through profit or loss, category [member]    
Financial assets    
Financial asset 112.0 301.2
Financial liabilities    
Financial liability 5,780.2 5,156.0
Financial liabilities at fair value through profit or loss, category [member] | Trade payables and put option granted on subsidiary and other liabilities [member]    
Financial liabilities    
Financial liability 5,764.1 5,106.1
Financial liabilities at fair value through profit or loss, category [member] | Financial liabilities, derivatives [member]    
Financial liabilities    
Financial liability 16.1 49.9
Financial liabilities at fair value through profit or loss, category [member] | Interest-bearing loans and borrowings [member]    
Financial liabilities    
Financial liability
Financial liabilities, derivative hedges, categories [member]    
Financial assets    
Financial asset 285.1 194.5
Financial liabilities    
Financial liability 201.4 663.5
Financial liabilities, derivative hedges, categories [member] | Trade payables and put option granted on subsidiary and other liabilities [member]    
Financial liabilities    
Financial liability
Financial liabilities, derivative hedges, categories [member] | Financial liabilities, derivatives [member]    
Financial liabilities    
Financial liability 201.4 663.5
Financial liabilities, derivative hedges, categories [member] | Interest-bearing loans and borrowings [member]    
Financial liabilities    
Financial liability
Financial liabilities at amortised cost, category [member]    
Financial assets    
Financial asset
Financial liabilities    
Financial liability 16,055.0 18,604.4
Financial liabilities at amortised cost, category [member] | Trade payables and put option granted on subsidiary and other liabilities [member]    
Financial liabilities    
Financial liability 13,502.0 13,208.1
Financial liabilities at amortised cost, category [member] | Financial liabilities, derivatives [member]    
Financial liabilities    
Financial liability
Financial liabilities at amortised cost, category [member] | Interest-bearing loans and borrowings [member]    
Financial liabilities    
Financial liability 2,553.0 5,396.3
Financial asset, cash and cash equivalents [member]    
Financial assets    
Financial asset 10,354.5 7,876.8
Financial asset, cash and cash equivalents [member] | Financial liabilities at fair value through profit or loss, category [member]    
Financial assets    
Financial asset
Financial asset, cash and cash equivalents [member] | Financial liabilities, derivative hedges, categories [member]    
Financial assets    
Financial asset
Financial asset, cash and cash equivalents [member] | Financial liabilities at amortised cost, category [member]    
Financial assets    
Financial asset
Financial asset, investment securities [member]    
Financial assets    
Financial asset 133.9 387.1
Financial asset, investment securities [member] | Financial liabilities at fair value through profit or loss, category [member]    
Financial assets    
Financial asset 11.9 282.8
Financial asset, investment securities [member] | Financial liabilities, derivative hedges, categories [member]    
Financial assets    
Financial asset
Financial asset, investment securities [member] | Financial liabilities at amortised cost, category [member]    
Financial assets    
Financial asset
Trade receivables [member]    
Financial assets    
Financial asset 7,505.0 6,962.5
Trade receivables [member] | Financial liabilities at fair value through profit or loss, category [member]    
Financial assets    
Financial asset
Trade receivables [member] | Financial liabilities, derivative hedges, categories [member]    
Financial assets    
Financial asset
Trade receivables [member] | Financial liabilities at amortised cost, category [member]    
Financial assets    
Financial asset
Derivatives [member]    
Financial assets    
Financial asset 385.2 212.9
Derivatives [member] | Financial liabilities at fair value through profit or loss, category [member]    
Financial assets    
Financial asset 100.1 18.4
Derivatives [member] | Financial liabilities, derivative hedges, categories [member]    
Financial assets    
Financial asset 285.1 194.5
Derivatives [member] | Financial liabilities at amortised cost, category [member]    
Financial assets    
Financial asset
Loans and receivables, category [member]    
Financial assets    
Financial asset 17,859.5 14,839.3
Financial liabilities    
Financial liability
Loans and receivables, category [member] | Trade payables and put option granted on subsidiary and other liabilities [member]    
Financial liabilities    
Financial liability
Loans and receivables, category [member] | Financial liabilities, derivatives [member]    
Financial liabilities    
Financial liability
Loans and receivables, category [member] | Interest-bearing loans and borrowings [member]    
Financial liabilities    
Financial liability
Loans and receivables, category [member] | Financial asset, cash and cash equivalents [member]    
Financial assets    
Financial asset 10,354.5 7,876.8
Loans and receivables, category [member] | Financial asset, investment securities [member]    
Financial assets    
Financial asset
Loans and receivables, category [member] | Trade receivables [member]    
Financial assets    
Financial asset 7,505.0 6,962.5
Loans and receivables, category [member] | Derivatives [member]    
Financial assets    
Financial asset
Held-to-maturity investments, category [member]    
Financial assets    
Financial asset 122.0 104.3
Financial liabilities    
Financial liability
Held-to-maturity investments, category [member] | Trade payables and put option granted on subsidiary and other liabilities [member]    
Financial liabilities    
Financial liability
Held-to-maturity investments, category [member] | Financial liabilities, derivatives [member]    
Financial liabilities    
Financial liability
Held-to-maturity investments, category [member] | Interest-bearing loans and borrowings [member]    
Financial liabilities    
Financial liability
Held-to-maturity investments, category [member] | Financial asset, cash and cash equivalents [member]    
Financial assets    
Financial asset
Held-to-maturity investments, category [member] | Financial asset, investment securities [member]    
Financial assets    
Financial asset 122.0 104.3
Held-to-maturity investments, category [member] | Trade receivables [member]    
Financial assets    
Financial asset
Held-to-maturity investments, category [member] | Derivatives [member]    
Financial assets    
Financial asset