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FINANCIAL INSTRUMENTS - Fair value disclosures (Details) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair value and other disclosures    
Net gain (loss) on financial assets at fair value through profit or loss $ 2,237 $ 265
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 into Level 3 of fair value hierarchy, assets 0 0
Transfers out of 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 assets 32,462 9,695
Financial liabilities 109,378 30,357
Financial assets at amortized cost    
Fair value and other disclosures    
Financial assets 30,878 8,172
Other short-term investments | Level 1 | At fair value    
Fair value and other disclosures    
Financial assets 62 1,463
Investments | Financial assets at amortized cost    
Fair value and other disclosures    
Financial assets at fair value 4,310  
Financial assets 5,183  
Government bonds | Level 1 | At fair value    
Fair value and other disclosures    
Financial assets 727 50
Other Investments | Level 1 | At fair value    
Fair value and other disclosures    
Financial assets   10
Financial debt    
Fair value and other disclosures    
Financial liabilities at fair value 78,787 11,459
Financial liabilities $ 79,312 10,844
Financial debt | Restated for compare    
Fair value and other disclosures    
Financial liabilities at fair value   16,918
Financial liabilities   $ 16,010