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26. EMPLOYEE BENEFITS (Details 7)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Employee Benefits Details 7    
Actuarial financing method Projected unit credit Projected unit credit
Functional currency Real (R$) Real (R$)
Recognition of plan assets Fair value Fair value
Nominal discount rate Milenium Plan: 10.42% Plan 35%: 10.30% and Supplementation: 10.32% Milenium Plan: 11.68%, Plan 35% and Suplementation: 11.72%
Inflation rate 5.00% 5.50%
Nominal salary increase rate 6.05% 6.56%
Nominal benefit increase rate 5.00% 5.50%
Rate of return on investments Milenium Plan: 10.42% Plan 35%: 10.30% and Supplementation: 10.32% Milenium Plan: 11.68%, Plan 35% and Suplementation: 11.72%
General mortality table 35% and Average Salary Supplementation Plans : AT 2000 segregated by gender (10% smoothed) Milenium Plan, 35% and Average Salary Supplementation Plans: AT 2000 segregated by gender (10% smoothed)
Disability table Plan 35% and Supplementation: Light Média Millênnium Plan: Prudential ( retirement) Light Median
Disability mortality table Winklevoss - 1% Winklevoss - 1%
Turnover table Millennium plan 5% p.a., nil for DB plans Millennium plan 5% p.a., nil for DB plans
Retirement age 100% on the first date he/she becomes eligible for programmed retirement benefit under the plan 100% on the first date he/she becomes eligible for programmed retirement benefit under the plan
Household of active participants 95% will be married at the time of retirement, with the wife being 4 years younger than the husband 95% will be married at the time of retirement, with the wife being 4 years younger than the husband