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EQUITY - Treasury Shares (Details) - ARS ($)
$ in Millions
Apr. 29, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 21, 2013
Equity            
Total equity   $ 228,913 $ 55,028 $ 54,673 $ 48,804  
Treasury shares (in shares)   15,221,373        
Treasury shares, Capital nominal value            
Equity            
Total equity [1],[2]   $ 15        
Maximum time period for sale of treasury shares 3 years          
Treasury shares (in shares)   15,221,373        
Percentage of treasury shares held   0.70%        
Voluntary reserve for capital investments            
Equity            
Total equity   $ 3,300 [3]       $ 1,200
Treasury shares acquisition cost            
Equity            
Total equity [2]   $ (1,795)        
[1] As of December 31, 2018 total shares (2,168,909,384), of $1 argentine peso of nominal value each, were issued and fully paid. As of December 31,2018, 15,221,373 were treasury shares.
[2] Corresponds to 15,221,373 shares of $1 argentine peso of nominal value each, equivalent to 0.70% of total capital. The treasury shares acquisition costs amounted to 1,795. See Note 20  to these consolidated financial statements.
[3] Correspond to the Facultative Reserves to maintain the capital investments level and the current level of solvency.