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FINANCIAL INSTRUMENTS - Fair value disclosures (Details) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair value and other disclosures    
Financial assets $ 45,628 $ 49,939
Net gain (loss) on financial assets at fair value through profit or loss 2,600 3,406
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities
Transfers into Level 3 of fair value hierarchy, assets
Transfers out of Level 3 of fair value hierarchy, assets
Transfers into Level 3 of fair value hierarchy, liabilities
Transfers out of Level 3 of fair value hierarchy, liabilities
Financial liabilities 203,718 168,265
Financial assets at amortized cost    
Fair value and other disclosures    
Financial assets 21,944 47,502
Other short-term investments | Level 1 | At fair value    
Fair value and other disclosures    
Financial assets 23,224 94
Investments | Financial assets at amortized cost    
Fair value and other disclosures    
Financial assets 1,066 7,917
Financial assets at fair value 1,060 6,630
Government bonds | Level 1 | At fair value    
Fair value and other disclosures    
Financial assets 297 1,119
Financial debt    
Fair value and other disclosures    
Financial liabilities at fair value 52,401 28,245
Financial liabilities $ 53,576 $ 29,052