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21 Employees benefits (Details 6)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
G0 plan [member]      
Summary of employee benefits [Line Items]      
Discount rate - actual rate (NTN-B) 3.07% 3.36% 4.84%
Inflation rate 3.25% 3.50% 4.01%
Nominal rate of salary growth 5.32% 5.57% 6.09%
Mortality table AT-2000 AT-2000 AT-2000
G1 Plan [member]      
Summary of employee benefits [Line Items]      
Discount rate - actual rate (NTN-B) 3.44% 3.37% 4.91%
Inflation rate 3.25% 3.50% 4.01%
Nominal rate of salary growth 5.32% 5.57% 6.09%
Mortality table AT-2000 AT-2000 AT-2000