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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)

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