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27. EMPLOYEE BENEFITS (Details 7) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Employee Benefits Details 7Abstract |  |
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: 9.69% Plan 35%: 9.60% Supplementation: 9.59% | Milenium Plan: 10.42% Plan 35%: 10.30% and Supplementation: 10.32%
Inflation rate | 4.75% | 5.00%
Nominal salary increase rate | 5.80% | 6.05%
Nominal benefit increase rate | 4.75% | 5.00%
Rate of return on investments | Millennium Plan: 9.69% Plan 35%: 9.60% Supplementation: 9.59% | Milenium Plan: 10.42% Plan 35%: 10.30% and Supplementation: 10.32%
General mortality table | 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. | 35% and Average Salary Supplementation Plans : AT 2000 segregated by gender (10% smoothed)
Disability table | 35% Plan and Supplementation: Light Medium. Millenium Plan: Prudential (Ferr. Retirement) | Plan 35% and Supplementation: Light Média Millênnium Plan: Prudential ( retirement)
Disability mortality table | Winklevoss - 1% | Winklevoss - 1%
Turnover table | Millenium plan 5% per annum, zero for plans 35% and Supplementation. | 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 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

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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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