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19. EMPLOYEES BENEFITS (Details 7) - Number
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Medical plan [Member]    
Economic hypothesis    
Discount rate 7.68% 7.39%
Inflation rate 3.25% 3.80%
Medical inflation 6.35% 6.91%
Wage growth rate
F.G.T.S. balance growth
Demoraphic data    
Number of active participants 1,245 1,115
Number of assisted beneficiary participants 559 572
Medical plan [Member] | Schedule of turnover - BRF's historical [Member]    
Demographic hypothesis    
Schedule of mortality, disabled, disabled mortality, turnover - BRF's historical 2,020 2,019
Medical plan [Member] | Schedule of mortality [Member]    
Demographic hypothesis    
Schedule of mortality, disabled, disabled mortality, turnover - BRF's historical AT-2000 smoothed by 10% AT-2000
F.G.T.S. Penalty [Member]    
Economic hypothesis    
Discount rate 6.51% 6.07%
Inflation rate 3.25% 3.80%
Medical inflation
Wage growth rate 3.25% 4.02%
F.G.T.S. balance growth 3.80% 3.90%
Demoraphic data    
Number of active participants 93,245 86,849
F.G.T.S. Penalty [Member] | Schedule of turnover - BRF's historical [Member]    
Demographic hypothesis    
Schedule of mortality, disabled, disabled mortality, turnover - BRF's historical 2,020 2,019
F.G.T.S. Penalty [Member] | Schedule of mortality [Member]    
Demographic hypothesis    
Schedule of mortality, disabled, disabled mortality, turnover - BRF's historical AT-2000 smoothed by 10% AT-2000
F.G.T.S. Penalty [Member] | Schedule of disabled [Member]    
Demographic hypothesis    
Schedule of mortality, disabled, disabled mortality, turnover - BRF's historical RRB-44 RRB-44
Other [Member]    
Economic hypothesis    
Discount rate [1] 6.51% 6.07%
Inflation rate [1] 3.25% 3.80%
Medical inflation [1]
Wage growth rate [1] 3.25% 4.02%
F.G.T.S. balance growth [1]
[1] Includes retirement compensation and life insurance benefits.