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Equity - Treasury Shares (Details) - ARS ($)
$ in Millions
Apr. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 21, 2013
Equity            
Total equity   $ 23,879 $ 19,878 $ 17,610 $ 14,769  
Treasury shares (in shares)   15,221,373 15,221,373 15,221,373    
Treasury shares, Capital nominal value            
Equity            
Total equity [2]   $ 15 [1] $ 15 [1],[3] $ 15 [3] 15 [3]  
Maximum time period for sale of treasury shares 3 years          
Treasury shares (in shares)   15,221,373        
Percentage of treasury shares held   1.55% 1.55% 1.55%    
Voluntary reserve for capital investments            
Equity            
Total equity   $ 461 [2] $ 3,191 [2] $ 3,191 [2] 3,191 [2] $ 1,200
Treasury shares acquisition cost            
Equity            
Total equity [2]   $ (461) $ (461) $ (461) $ (461)  
[1] As of December 31, 2017 and 2016, total shares (984,380,978), of $1 argentine peso of nominal value each, were issued and fully paid. As of the same dates; 15,221,373 were treasury shares.
[2] Corresponds to 15,221,373 shares of $1 argentine peso of nominal value each, equivalent to 1.55% of total capital. The treasury shares acquisition costs amounted to 461. See Note 19 - Equity to these consolidated financial statements.
[3] As of December 31, 2016, 2015 and 2014, total shares ( 984,380,978 ), of $1 argentine peso of nominal value each, were issued and fully paid. As of the same dates; 15,221,373 were treasury shares.