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v3.20.1

23 Post-employment benefits (Details 3) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Inflation P.Y. [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Real rate |  |
Nominal rate | 2.90% | 4.00%
Expected Rate Of Discount/Return P.Y. [Member] | Unified Plan Defined Benefit [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Real rate | 3.05% | 4.60%
Nominal rate | 6.04% | 8.78%
Expected Rate Of Discount/Return P.Y. [Member] | Unified Plan - Balance [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Real rate | 3.20% | 4.60%
Nominal rate | 6.19% | 8.78%
Expected Rate Of Discount/Return P.Y. [Member] | Plan III [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Real rate | 3.20% | 4.60%
Nominal rate | 6.19% | 8.78%
Expected Rate Of Discount/Return P.Y. [Member] | Assistance Plan [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Real rate | 3.30% | 4.60%
Nominal rate | 6.30% | 8.78%
Salary Growth [Member] | Plan III [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Real rate | 1.50% | 1.50%
Nominal rate | 4.44% | 5.56%
Salary Growth [Member] | Unified Plan [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Real rate | 1.00% | 2.00%
Nominal rate | 3.93% | 6.08%
Demographic [Member] | Mortality Table [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Nominal assumption | AT - 2000 | AT - 2000
Demographic [Member] | Mortality Table Of Individuals With Permanent Disability [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Nominal assumption | WINKLEVOSS | WINKLEVOSS
Demographic [Member] | Table Of New Disability Benefit Vested [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Nominal assumption | TASA 1927 | TASA 1927

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