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Financial Risk Management - Information about Financial Assets and Liabilities That Accrues Interest Considering Applicable Rate (Details) (Detail) - ARS ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets $ 100,190 $ 78,280 $ 61,585
Financial liabilities 242,749 $ 202,853 $ 146,355
Interest rate risk [member]      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets 4,068    
Financial liabilities 191,063    
Interest rate risk [member] | Fixed interest rate [member]      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets 2,100    
Financial liabilities 149,306    
Interest rate risk [member] | Variable interest rate [member]      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets 1,968    
Financial liabilities $ 41,757