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31 Benefit plans (Details 5)
$ in Millions
Dec. 31, 2020
ARS ($)
In 2021 [member]  
DisclosureOfBenefitPlansLineItems [Line Items]  
Benefit payment obligations $ 84
In 2022 [member]  
DisclosureOfBenefitPlansLineItems [Line Items]  
Benefit payment obligations 15
In 2023 [member]  
DisclosureOfBenefitPlansLineItems [Line Items]  
Benefit payment obligations 16
In 2024 [member]  
DisclosureOfBenefitPlansLineItems [Line Items]  
Benefit payment obligations 17
In 2025 [member]  
DisclosureOfBenefitPlansLineItems [Line Items]  
Benefit payment obligations 4
Between 2026 to 2030 [member]  
DisclosureOfBenefitPlansLineItems [Line Items]  
Benefit payment obligations $ 17