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24. POST-EMPLOYMENT OBLIGATIONS (Details 10)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension plans and retirement supplement plans [member]      
Disclosure of defined benefit plans [line items]      
Annual discount rate for present value of the actuarial obligation 6.83% 6.87% 9.02%
Annual expected return on plan assets 6.83% 6.87% 9.02%
Long-term annual inflation rate 3.32% 3.61% 4.01%
Estimated future annual salary increases 3.32% 3.61% 4.01%
General mortality table AT-2000 M S10% D10% AT-2000 M S10% D10% AT-2000 M S10% D10%
Disability table Not applicable Not applicable Not applicable
Disabled mortality table AT-49 M AT-49 M AT 49 M
Real growth in contributions above inflation [1]
Health plan [member]      
Disclosure of defined benefit plans [line items]      
Annual discount rate for present value of the actuarial obligation 7.14% 7.09% 9.60%
Long-term annual inflation rate 3.32% 3.61% 4.00%
General mortality table AT-2000 M S10% D20% AT-2000 M S10% D20% AT-2000 M S10% D20%
Disability table Álvaro Vindas D30% Álvaro Vindas D30% Álvaro Vindas D30%
Disabled mortality table MI-85 F MI-85 F Winklevoss D30%
Real growth in contributions above inflation [1] 1.00% 1.00% 1.00%
Life insurance plan [member]      
Disclosure of defined benefit plans [line items]      
Annual discount rate for present value of the actuarial obligation 7.25% 7.19% 9.57%
Long-term annual inflation rate 3.32% 3.61% 4.00%
Estimated future annual salary increases 4.56% 4.85% 6.08%
General mortality table AT-2000 M S10% D20% AT-2000 M S10% D20% AT-2000 M S10% D20%
Disability table Álvaro Vindas D30% Álvaro Vindas D30% Álvaro Vindas D30%
Disabled mortality table MI-85 F MI-85 F Winklevoss D30%
Real growth in contributions above inflation [1]
[1] Starting in 2018, Company adopted the assumption of real growth of the contributions above inflation at the rate of 1% p.a.