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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, 2017
Dec. 31, 2016
Total cost exposure [member]    
Statement Line Items [Line Items]    
Risk R$ (9,742.3) R$ (8,807.6)
Notional 9,318.9 8,624.1
Fair Value Assets 283.6 190.7
Fair Value Liability (190.0) (582.8)
Gain (loss) Finance Result (563.5) (1,397.5)
Gain (loss) Operational Result (200.2) 737.4
Gain (loss) Equity 584.8 (873.3)
Commodity risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk (2,378.7) (1,742.8)
Notional 1,955.3 1,559.3
Fair Value Assets 166.5 136.5
Fair Value Liability (70.7) (43.7)
Gain (loss) Finance Result (1.5) (5.4)
Gain (loss) Operational Result 103.6 (97.0)
Gain (loss) Equity (4.8) 90.3
American dollar risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk (6,879.1) (6,566.9)
Notional 6,879.1 6,566.9
Fair Value Assets 86.3 36.0
Fair Value Liability (93.4) (491.3)
Gain (loss) Finance Result (556.1) (1,392.6)
Gain (loss) Operational Result (331.5) 782.2
Gain (loss) Equity 630.2 (909.0)
Euro risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk (82.9) (135.2)
Notional 82.9 135.2
Fair Value Assets 3.5
Fair Value Liability (0.7) (4.7)
Gain (loss) Finance Result (4.7) 3.2
Gain (loss) Operational Result 0.4 56.1
Gain (loss) Equity 6.6 (42.1)
Mexican Pesos risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk (401.6) (359.2)
Notional 401.6 359.2
Fair Value Assets 27.3 18.2
Fair Value Liability (25.2) (43.3)
Gain (loss) Finance Result (1.2) (2.9)
Gain (loss) Operational Result 27.3 (4.3)
Gain (loss) Equity (47.2) (13.2)
Total fixed asset exposure [member]    
Statement Line Items [Line Items]    
Risk (579.5) (523.1)
Notional 579.5 523.1
Fair Value Assets 1.9 3.0
Fair Value Liability (10.8) (76.1)
Gain (loss) Finance Result (1.9) (187.0)
Gain (loss) Operational Result
Gain (loss) Equity
Brazilian Real risk portion of cost exposure [member]    
Statement Line Items [Line Items]    
Risk   (3.5)
Notional   3.5
Fair Value Assets  
Fair Value Liability   0.2
Gain (loss) Finance Result   0.2
Gain (loss) Operational Result   0.4
Gain (loss) Equity   0.7
American Dollar risk portion of fixed assets exposure [member]    
Statement Line Items [Line Items]    
Risk (531.9) (430.3)
Notional 531.9 430.3
Fair Value Assets 1.8 3.0
Fair Value Liability (10.8) (5.8)
Gain (loss) Finance Result (2.8) (119.0)
Gain (loss) Operational Result
Gain (loss) Equity
Euro risk portion of fixed assets exposure [member]    
Statement Line Items [Line Items]    
Risk (47.6) (92.8)
Notional 47.6 92.8
Fair Value Assets 0.1
Fair Value Liability (70.3)
Gain (loss) Finance Result 0.9 (68.0)
Gain (loss) Operational Result
Gain (loss) Equity
Total expenses exposure [member]    
Statement Line Items [Line Items]    
Risk (177.7) (103.7)
Notional 177.7 103.7
Fair Value Assets 0.5 0.8
Fair Value Liability (1.8) (1.1)
Gain (loss) Finance Result (2.9) 47.6
Gain (loss) Operational Result 3.9 5.8
Gain (loss) Equity 1.8 (134.2)
American Dollar risk portion of the expenses exposure [member]    
Statement Line Items [Line Items]    
Risk (169.2) (90.9)
Notional 169.2 90.9
Fair Value Assets 0.3
Fair Value Liability (1.6) (1.1)
Gain (loss) Finance Result (3.1) (3.0)
Gain (loss) Operational Result 3.5 5.8
Gain (loss) Equity 2.4 (29.4)
Rupee risk portion of the expenses exposure [member]    
Statement Line Items [Line Items]    
Risk (8.5)  
Notional 8.5  
Fair Value Assets 0.2  
Fair Value Liability (0.2)  
Gain (loss) Finance Result 0.2  
Gain (loss) Operational Result 0.4  
Gain (loss) Equity (0.6)  
Total cash exposure [member]    
Statement Line Items [Line Items]    
Risk (1,328.3) 1,043.8
Notional 1,328.3 (1,043.8)
Fair Value Assets
Fair Value Liability (13.1) 7.8
Gain (loss) Finance Result (266.0) (3.7)
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) 592.3
Notional 1,313.3 (592.3)
Fair Value Assets
Fair Value Liability (13.1) 7.8
Gain (loss) Finance Result (266.0) (55.8)
Gain (loss) Operational Result
Gain (loss) Equity
Euro risk portion of the expenses exposure [member]    
Statement Line Items [Line Items]    
Risk  
Notional  
Fair Value Assets  
Fair Value Liability  
Gain (loss) Finance Result   (0.3)
Gain (loss) Operational Result  
Gain (loss) Equity   0.7
Interest rate risk portion of the cash exposure [member]    
Statement Line Items [Line Items]    
Risk (15.0) 400.0
Notional 15.0 (400.0)
Fair Value Assets
Fair Value Liability (0.1)
Gain (loss) Finance Result 40.5
Gain (loss) Operational Result
Gain (loss) Equity
Canadian dollar risk portion of the expenses exposure [member]    
Statement Line Items [Line Items]    
Risk  
Notional  
Fair Value Assets  
Fair Value Liability  
Gain (loss) Finance Result   50.9
Gain (loss) Operational Result  
Gain (loss) Equity   (106.3)
Total debts exposure [member]    
Statement Line Items [Line Items]    
Risk (919.5) (2,547.9)
Notional 356.9 2,000.2
Fair Value Assets 30.0 18.4
Fair Value Liability (1.8) (61.2)
Gain (loss) Finance Result (67.5) (50.7)
Gain (loss) Operational Result
Gain (loss) Equity
Brazilian Real risk portion of the expenses exposure [member]    
Statement Line Items [Line Items]    
Risk   (12.8)
Notional   12.8
Fair Value Assets   0.8
Fair Value Liability  
Gain (loss) Finance Result  
Gain (loss) Operational Result  
Gain (loss) Equity   0.8
American Dollar risk portion of the debts exposure [member]    
Statement Line Items [Line Items]    
Risk (562.6) (1,874.2)
Notional 1,326.5
Fair Value Assets 2.6
Fair Value Liability (48.5)
Gain (loss) Finance Result (76.2) (28.7)
Gain (loss) Operational Result
Gain (loss) Equity
Interest rate risk portion of the debts exposure [member]    
Statement Line Items [Line Items]    
Risk (356.9) (673.7)
Notional 356.9 673.7
Fair Value Assets 30.0 15.8
Fair Value Liability (1.8) (12.7)
Gain (loss) Finance Result 8.7 (22.0)
Gain (loss) Operational Result
Gain (loss) Equity
Total equity exposure [member]    
Statement Line Items [Line Items]    
Risk (2,347.9)  
Notional 677.0  
Fair Value Assets 69.2  
Fair Value Liability  
Gain (loss) Finance Result 67.0  
Gain (loss) Operational Result  
Gain (loss) Equity  
Euro risk portion of the cash exposure [member]    
Statement Line Items [Line Items]    
Risk   51.5
Notional   (51.5)
Fair Value Assets  
Fair Value Liability   0.1
Gain (loss) Finance Result   11.6
Gain (loss) Operational Result  
Gain (loss) Equity  
Stock exchange price risk portion of the equity instrument exposure [member]    
Statement Line Items [Line Items]    
Risk (2,347.9)  
Notional 677.0  
Fair Value Assets 69.2  
Fair Value Liability  
Gain (loss) Finance Result 67.0  
Gain (loss) Operational Result  
Gain (loss) Equity  
Total financial risk exposure [member]    
Statement Line Items [Line Items]    
Risk (15,095.2) (10,938.5)
Notional 12,438.3 10,207.3
Fair Value Assets 385.2 212.9
Fair Value Liability (217.5) (713.4)
Gain (loss) Finance Result (834.8) (1,592.5)
Gain (loss) Operational Result (196.3) 743.2
Gain (loss) Equity R$ 586.6 (972.1)
Total foreign investments exposure [member]    
Statement Line Items [Line Items]    
Risk  
Notional  
Fair Value Assets  
Fair Value Liability  
Gain (loss) Finance Result   (1.2)
Gain (loss) Operational Result  
Gain (loss) Equity   35.4
American Dollar risk portion of the foreign investments exposure [member]    
Statement Line Items [Line Items]    
Risk  
Notional  
Fair Value Assets  
Fair Value Liability  
Gain (loss) Finance Result   (0.9)
Gain (loss) Operational Result  
Gain (loss) Equity   37.2
Euro risk portion of the foreign investments exposure [member]    
Statement Line Items [Line Items]    
Risk  
Notional  
Fair Value Assets  
Fair Value Liability  
Gain (loss) Finance Result  
Gain (loss) Operational Result  
Gain (loss) Equity   1.7
Canadian Dollar risk portion of the foreign investments exposure [member]    
Statement Line Items [Line Items]    
Risk  
Notional  
Fair Value Assets  
Fair Value Liability  
Gain (loss) Finance Result   (0.3)
Gain (loss) Operational Result  
Gain (loss) Equity   R$ (3.5)