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27. EMPLOYEE BENEFITS (Tables)
12 Months Ended
Dec. 31, 2018
Employee Benefits Tables Abstract  
Actuarial employee benefit assets and liabilities
              Consolidated
  12/31/2018   12/31/2017   12/31/2018   12/31/2017
  Actuarial asset   Actuarial liabilities
Benefits of pension plans (99,894)   (111,281)   7,982   41,937
Post-employment healthcare benefits -   -   897,137   866,784
  (99,894)   (111,281)   905,119   908,721
               
               
Reconciliation of employee benefits' assets and liabilities
  12/31/2018   12/31/2017
Present value of defined benefit obligation 3,087,433   3,077,849
Fair value of plan assets (3,403,906)   (3,305,356)
Deficit(Surplus) (316,473)   (227,507)
Restriction to actuarial assets due to recovery limitation 224,561   158,163
Liabilities (Assets), net (91,912)   (69,344)
Liabilities 7,982   41,937
Assets (99,894)   (111,281)
Net (assets) recognized in the balance sheet (91,912)   (69,344)
Changes in present value of the defined benefit obligation
  12/31/2018   12/31/2017
Present value of obligations at the beginning of the year 3,077,849   2,872,442
Cost of service 1,169   1,285
Interest cost 304,132   322,359
Benefits paid (280,493)   (284,777)
Actuarial loss/(gain) (15,224)   166,540
Present value of obligations at the end of the year 3,087,433   3,077,849
Changes in fair value of the plan assets
  12/31/2018   12/31/2017
Fair value of plan assets at the beginning of the year (3,305,356)   (3,193,493)
Interest income (327,830)   (360,013)
Benefits Paid 280,493   284,777
Return on plan assets (less interest income) (51,213)   (36,627)
Fair value of plan assets at the end of the year (3,403,906)   (3,305,356)
Employee benefits recognized in the income statement

  12/31/2018   12/31/2017   12/31/2016
Cost of current service 1,169   1,285   1,244
Interest cost 304,132   322,359   311,361
Expected return on plan assets (327,830)   (360,013)   (345,521)
Interest on the asset ceiling effect 16,340   26,843   22,189
  (6,189)   (9,526)   (10,727)
Total unrecognized costs / (income) (*) -   6   7
Total costs / (income) recognized in the income statement (6,189)   (9,532)   (10,734)
Total costs / (income), net (*) (6,189)   (9.526)   (10,727)

Changes in actuarial gains and losses
  12/31/2018   12/31/2017   12/31/2016
Actuarial losses and (gains) (15,224)   166,540   393,743
Return on plan assets (less interest income) (51,213)   (36,627)   (427,523)
Change in the asset’s limit (excluding interest income) 50,058   (97,882)   41,796
  (16,379)   32,031   8,016
Actuarial losses and (gains) recognized in other comprehensive income (16,379)   32,037   8,023
Unrecognized actuarial (gains) -   (6)   (7)
Total cost of actuarial losses and (gains) (*) (16,379)   32,031   8,016
Breakdown of actuarial gains or losses
  12/31/2018
Loss due to change in demographic assumptions (139,813)
Loss due to change in financial assumptions 46,917
Loss due to experience adjustments 77,672
Return on plan assets (less interest income) (51,213)
Change in asset limit (excluding interest income) 50,058
Actuarial losses and (gains) (16.379)
Actuarial assumptions used

  12/31/2018   12/31/2017
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%   Millennium Plan: 10.42%                          Plan 35%: 10.30%                     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%   Millennium Plan: 10.42%
 Plan 35%: 9.60%                                         Supplementation: 9.59%    Plan 35%: 10.30%                                      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.

  Millennium Plan, Plans 35% and Supplementation of Average Salary: AT 2000 segregated by gender (10% smoothed)
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

Average life expectancy
  Plan covering 35% of the average salary   Average salary supplementation plan   Mixed supplementary benefit plan (Milênio Plan)
  12/31/2018   12/31/2017   12/31/2018   12/31/2017   12/31/2018   12/31/2017
                       
Longevity at age of 65 for current participants                      
Male 18.00   21.00   18.74   20.45   21.00   21.00
Female 18.00   23.00   22.23   23.02   23.00   23.00
                       
Longevity at age of 65 for current participants who are 40                      
Male 40.00   43.00   40.60   42.69   43.00   43.00
Female 40.00   47.00   45.37   46.29   47.00   47.00
Allocation of plan assets
      12/31/2018       12/31/2017
Variable income           141,705   4,16%               50,966   1,54%
Fixed income        3,050,099   89,61%          3,085,783   93,36%
Real estate             52,091   1,53%               44,083   1,33%
Others           160,011   4,70%             124,524   3,77%
Total        3,403,906   100,00%          3,305,356   100,00%
Quantitative sensitivity analysis regarding the significant assumptions for the pension plans

                  12/31/2018
    Plan covering 35% of the average salary   Average salary supplementation plan   Mixed supplementary benefit plan (Milênio Plan)
Assumption: Discount rate                  
Sensitivity level   0.5% -0.5%   0.5% -0.5%   0.5% -0.5%
Effect on current service cost and on interest on actuarial obligations                    409                (458)                 1,650             (1,897)                  (502)                  316
Effect on present value of obligations             (13,281)             15,342             (70,755)             76,222             (50,666)             54,396
                   
Assumption: Salary growth                  
Sensitivity level   0.5% -0.5%   0.5% -0.5%   0.5% -0.5%
Effect on current service cost and on interest on actuarial obligations                                252                (223)
Effect on present value of obligations                             2,028             (1,792)
                   
Assumption: Benefit adjustment                  
Sensitivity level   0.5% -0.5%   0.5% -0.5%   0.5% -0.5%
Effect on current service cost and on interest on actuarial obligations                 1,439             (1,350)                 7,578             (7,079)                 5,720             (5,232)
Effect on present value of obligations               14,685           (13,778)               79,305           (74,101)               57,166           (52,366)
                   
Assumption: Mortality table                  
Sensitivity level   1.0% -1.0%   1.0% -1.0%   1.0% -1.0%
Effect on current service cost and on interest on actuarial obligations               (1,052)               1,054               (4,877)               4,845               (1,120)               1,128
Effect on present value of obligations             (10,680)             10,706             (50,807)             50,468             (12,179)             12,165

Forecast benefit payments of the defined benefit plans
Payments     2018
Year 1     244,606
Year 2     252,778
Year 3     269,332
Year 4     265,261
Year 5     271,570
Next 5 years     1,436,738
Total forecast payments     2,740,285
Post-employment health care plan amounts
  12/31/2018   12/31/2017
Present value of obligations           897,137             866,784
Liabilities       897,137         866,784
Reconciliation of the healthcare liabilities

  12/31/2018   12/31/2017
Actuarial liability at the beginning of the year           866,784             691,262
Expenses recognized in income for the year             85,748               77,269
Sponsor's contributions transferred in prior year           (71,632)             (72,192)
Recognition of actuarial loss/ (gain)             16,237             170,445
Actuarial liability at the end of the year       897,137         866,784

Actuarial gains and losses recognized in shareholders' equity

  12/31/2018   12/31/2017   12/31/2016
  Actuarial gain /(loss) on obligation               16,237             170,445   210,257
  Gain/(loss) recognized in shareholders' equity               16,237             170,445   210,257

Weighted average life expectancy
       
  12/31/2018   12/31/2017
Longevity at age of 65 for current participants      
Male               19.55                 19.55
Female               22.17                 22.17
       
Longevity at age of 65 for current participants who are 40      
Male               41.59                 41.59
Female               45.30                 45.30
Actuarial assumptions used for calculating postemployment healthcare benefits

  12/31/2018   12/31/2017
Biometric and Demographic      
General mortality table AT 2000 segregated by gender   AT 2000 segregated by gender
       
Financial      
Actuarial nominal discount rate 9.62%   10.34%
Inflation 4.75%   5.00%
Real increase in medical costs based on age (Aging Factor) 0.5% - 3.00% real a.a.   0.5% - 3.00% real a.a.
Nominal increase medical costs growth rate 8.15%   8.41%
Average medical cost (Claim cost)                                   1,054.65                                     1,001.69

Quantitative sensitivity analysis regarding the significant assumptions for the postemployment healthcare plans

      12/31/2018  
    Healthcare Plan  
    Assumption: Discount rate  
Sensitivity level   0.5% -0.5%
Effect on current service cost and on interest on actuarial obligations                          909                      (992)  
Effect on present value of obligations                   (35,530)                   38,727  
         
    Assumption: Medical Inflation  
Sensitivity level   1.0% -1.0%  
Effect on current service cost and on interest on actuarial obligations                       8,091                   (6,925)  
Effect on present value of obligations                     84,560                 (72,369)  
         
    Assumption: Mortality table  
Sensitivity level   1.0% -1.0%  
Effect on current service cost and on interest on actuarial obligations                     (2,161)                     2,148  
Effect on present value of obligations                   (22,582)                   22,451  

Forecast benefit payments of the postemployment healthcare plans
Forecast benefit payments     2018
Year 1                 78,100
Year 2                 80,787
Year 3                 83,232
Year 4                 85,386
Year 5                 87,224
Next 5 years               450,767
Total forecast payments               865,496