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Note 27 - Financial Instruments and Risks - Transactions Protected by Derivative Financial Instruments (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Total cost exposure [member]    
Statement Line Items [Line Items]    
Risk R$ (11,793.2) R$ (9,742.3)
Notional 11,607.3 9,318.9
Fair Value Assets 184.4 283.6
Fair Value Liability (394.2) (190.0)
Gain (loss) Finance Result (784.4) (563.5)
Gain (loss) Operational Result 1,182.8 (200.2)
Gain (loss) Equity 1,733.6 584.8
Commodity risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk (2,597.0) (2,378.7)
Notional 2,411.1 1,955.3
Fair Value Assets 14.9 166.5
Fair Value Liability (270.6) (70.7)
Gain (loss) Finance Result (104.1) (1.5)
Gain (loss) Operational Result 78.4 103.6
Gain (loss) Equity (160.0) (4.8)
American dollar risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk (8,774.3) (6,879.1)
Notional 8,774.3 6,879.1
Fair Value Assets 128.4 86.3
Fair Value Liability (119.9) (93.4)
Gain (loss) Finance Result (681.5) (556.1)
Gain (loss) Operational Result 1,080.7 (331.5)
Gain (loss) Equity 1,796.0 630.2
Euro risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk (152.4) (82.9)
Notional 152.4 82.9
Fair Value Assets 2.2 3.5
Fair Value Liability (1.0) (0.7)
Gain (loss) Finance Result (3.0) (4.7)
Gain (loss) Operational Result 4.6 0.4
Gain (loss) Equity 2.8 6.6
Mexican Pesos risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk (269.5) (401.6)
Notional 269.5 401.6
Fair Value Assets 38.9 27.3
Fair Value Liability (2.7) (25.2)
Gain (loss) Finance Result 4.2 (1.2)
Gain (loss) Operational Result 19.1 27.3
Gain (loss) Equity 94.8 (47.2)
Total fixed asset exposure [member]    
Statement Line Items [Line Items]    
Risk (890.0) (579.5)
Notional 890.0 579.5
Fair Value Assets 23.7 1.9
Fair Value Liability (29.3) (10.8)
Gain (loss) Finance Result 21.9 (1.9)
Gain (loss) Operational Result
Gain (loss) Equity
American Dollar risk portion of fixed assets exposure [member]    
Statement Line Items [Line Items]    
Risk (890.0) (531.9)
Notional 890.0 531.9
Fair Value Assets 23.7 1.8
Fair Value Liability (29.1) (10.8)
Gain (loss) Finance Result 19.3 (2.8)
Gain (loss) Operational Result
Gain (loss) Equity
Euro risk portion of fixed assets exposure [member]    
Statement Line Items [Line Items]    
Risk (47.6)
Notional 47.6
Fair Value Assets 0.1
Fair Value Liability (0.2)
Gain (loss) Finance Result 2.6 0.9
Gain (loss) Operational Result
Gain (loss) Equity
Total expenses exposure [member]    
Statement Line Items [Line Items]    
Risk (314.0) (177.7)
Notional 314.0 177.7
Fair Value Assets 11.4 0.5
Fair Value Liability (14.2) (1.8)
Gain (loss) Finance Result (0.4) (2.9)
Gain (loss) Operational Result 17.7 3.9
Gain (loss) Equity (0.6) 1.8
American Dollar risk portion of the expenses exposure [member]    
Statement Line Items [Line Items]    
Risk (311.8) (169.2)
Notional 311.8 169.2
Fair Value Assets 11.4 0.3
Fair Value Liability (14.2) (1.6)
Gain (loss) Finance Result (0.8) (3.1)
Gain (loss) Operational Result 18.5 3.5
Gain (loss) Equity 2.4
Rupee risk portion of the expenses exposure [member]    
Statement Line Items [Line Items]    
Risk (2.2) (8.5)
Notional 2.2 8.5
Fair Value Assets 0.2
Fair Value Liability (0.2)
Gain (loss) Finance Result 0.4 0.2
Gain (loss) Operational Result (0.8) 0.4
Gain (loss) Equity (0.6) (0.6)
Total cash exposure [member]    
Statement Line Items [Line Items]    
Risk (15.0) (1,328.3)
Notional 15.0 1,328.3
Fair Value Assets 0.4
Fair Value Liability (13.1)
Gain (loss) Finance Result (347.4) (266.0)
Gain (loss) Operational Result
Gain (loss) Equity
American Dollar risk portion of the cash exposure [member]    
Statement Line Items [Line Items]    
Risk (1,313.3)
Notional 1,313.3
Fair Value Assets 0.3
Fair Value Liability (13.1)
Gain (loss) Finance Result (347.3) (266.0)
Gain (loss) Operational Result
Gain (loss) Equity
Interest rate risk portion of the cash exposure [member]    
Statement Line Items [Line Items]    
Risk (15.0) (15.0)
Notional 15.0 15.0
Fair Value Assets 0.1
Fair Value Liability
Gain (loss) Finance Result (0.1)
Gain (loss) Operational Result
Gain (loss) Equity
Total debts exposure [member]    
Statement Line Items [Line Items]    
Risk (1,010.6) (919.5)
Notional 338.2 356.9
Fair Value Assets 34.9 30.0
Fair Value Liability (1.1) (1.8)
Gain (loss) Finance Result 89.6 (67.5)
Gain (loss) Operational Result
Gain (loss) Equity
American Dollar risk portion of the debts exposure [member]    
Statement Line Items [Line Items]    
Risk (672.4) (562.6)
Notional
Fair Value Assets
Fair Value Liability
Gain (loss) Finance Result 73.2 (76.2)
Gain (loss) Operational Result
Gain (loss) Equity
Interest rate risk portion of the debts exposure [member]    
Statement Line Items [Line Items]    
Risk (338.2) (356.9)
Notional 338.2 356.9
Fair Value Assets 34.9 30.0
Fair Value Liability (1.1) (1.8)
Gain (loss) Finance Result 16.4 8.7
Gain (loss) Operational Result
Gain (loss) Equity
Total equity exposure [member]    
Statement Line Items [Line Items]    
Risk (1,535.4) (2,347.9)
Notional 1,108.4 677.0
Fair Value Assets 0.1 69.2
Fair Value Liability (243.0)
Gain (loss) Finance Result (378.2) 67.0
Gain (loss) Operational Result
Gain (loss) Equity
Stock exchange price risk portion of the equity instrument exposure [member]    
Statement Line Items [Line Items]    
Risk (1,535.4) (2,347.9)
Notional 1,108.4 677.0
Fair Value Assets 0.1 69.2
Fair Value Liability (243.0)
Gain (loss) Finance Result (378.2) 67.0
Gain (loss) Operational Result
Gain (loss) Equity
Total financial risk exposure [member]    
Statement Line Items [Line Items]    
Risk (15,558.2) (15,095.2)
Notional 14,272.9 12,438.3
Fair Value Assets 254.9 385.2
Fair Value Liability (681.8) (217.5)
Gain (loss) Finance Result (1,394.6) (834.8)
Gain (loss) Operational Result 1,143.5 (196.3)
Gain (loss) Equity 1,740.4 R$ 586.6
Total foreign investments exposure [member]    
Statement Line Items [Line Items]    
Notional  
Fair Value Assets  
Fair Value Liability  
Gain (loss) Finance Result 4.3  
Gain (loss) Operational Result (57.0)  
Gain (loss) Equity 7.4  
American Dollar risk portion of the foreign investments exposure [member]    
Statement Line Items [Line Items]    
Notional  
Fair Value Assets  
Fair Value Liability  
Gain (loss) Finance Result 4.3  
Gain (loss) Operational Result (57.0)  
Gain (loss) Equity R$ 7.4