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FINANCIAL INSTRUMENTS - Fair value hierarchy and other disclosures (Details) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair value and other disclosures    
Financial assets $ 45,686 $ 62,118
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets 0 0
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets 0 0
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities 0 0
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities 0 0
Transfers out of Level 3 of fair value hierarchy, assets 0 0
Transfers into Level 3 of fair value hierarchy, assets 0 0
Transfers into Level 3 of fair value hierarchy, liabilities 0 0
Transfers out of Level 3 of fair value hierarchy, liabilities 0 0
Financial liabilities 267,959 277,342
Amortized cost    
Fair value and other disclosures    
Financial assets 28,852 29,874
Other short-term investments | Level 1 | At fair value    
Fair value and other disclosures    
Financial assets 8,797 31,531
Investments | Amortized cost    
Fair value and other disclosures    
Financial assets at fair value 176 1,443
Financial assets 171 1,452
Government bonds | Level 1 | At fair value    
Fair value and other disclosures    
Financial assets 6,593 404
Financial debt    
Fair value and other disclosures    
Financial liabilities 200,200 206,928
Financial liabilities at fair value 186,693 203,393
Notes    
Fair value and other disclosures    
Financial liabilities 95,297 72,938
Financial liabilities at fair value 88,290 71,339
Other financial debts    
Fair value and other disclosures    
Financial liabilities 104,903 133,990
Financial liabilities at fair value $ 98,403 $ 132,054