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12. FINANCIAL INSTRUMENTS (Details 12)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
Hedge accounting of exports  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Notional amount R$ 1,317,667
Risk Dollar
Hedge accounting of exports | Probable Scenario  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement R$ (92,105) [1]
Hedge accounting of exports | Scenario 1  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement 1,089,711
Hedge accounting of exports | Scenario 2  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement 2,179,422
Currency position  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Notional amount R$ (3,343,057)
Risk Dollar
Currency position | Probable Scenario  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement R$ 233,680 [1]
Currency position | Scenario 1  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement (2,764,708)
Currency position | Scenario 2  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement (5,529,416)
Consolidated exchange position  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Notional amount R$ (2,025,390)
Risk Dollar
Consolidated exchange position | Probable Scenario  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement R$ 141,575 [1]
Consolidated exchange position | Scenario 1  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement (1,674,997)
Consolidated exchange position | Scenario 2  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement (3,349,994)
Net Investment hedge accounting  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Notional amount R$ 72,000
Risk Euro
Net Investment hedge accounting | Probable Scenario  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement R$ 4,334 [1]
Net Investment hedge accounting | Scenario 1  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement 71,447
Net Investment hedge accounting | Scenario 2  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement 142,894
Currency position  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Notional amount R$ (69,203)
Risk Euro
Currency position | Probable Scenario  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement R$ (4,166) [1]
Currency position | Scenario 1  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement (68,672)
Currency position | Scenario 2  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement (137,344)
Consolidated exchange position  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Notional amount R$ 2,797
Risk Euro
Consolidated exchange position | Probable Scenario  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement R$ 168 [1]
Consolidated exchange position | Scenario 1  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement 2,775
Consolidated exchange position | Scenario 2  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effects on income statement R$ 5,550
[1] The probable sceneries were calculated considering the following variations to the specified risks: Real x Dollar - appreciation of Real in 2.11% / Real x Euro - appreciation of Real in 1.52%. Source: Quotation from Central Bank of Brazil and Central Bank of Europe on 02/16/2018.