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26 EMPLOYEE BENEFITS (Details 7)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Employee Benefits [Abstract]    
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 Millennium Plan: 6.98% Plan 35%: 6.75% Supplementation: 6.81% Millennium Plan: 9.69% Plan 35%: 9.60% Supplementation: 9.59%
Inflation rate 3.61% 4.75%
Nominal salary increase rate 4.65% 5.80%
Nominal benefit increase rate 3.61% 4.75%
General mortality table Millennium Plan: 9.69% Plan 35%: 9.60% Supplementation: 9.59% Millennium Plan: AT-2000 smoothed down by 10% segregated by gender. Plans 35%: AT-2000 Male aggravated by 15%. Supplementation: AT-2000 aggravated by 10% segregated by gender.
Disability table 35% Plan and Supplementation: Light Medium. Millenium Plan: Prudential (Ferr. Retirement) 35% Plan and Supplementation: Light Medium. Millenium Plan: Prudential (Ferr. Retirement)
Disability mortality table Winklevoss - 1% Winklevoss - 1%
Turnover table Millenium plan 5% per annum, zero for plans 35% and Supplementation. Millenium plan 5% per annum, zero for plans 35% and Supplementation.
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 composition 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