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Balances and Transactions with Related Parties - Summary of Compensation of Key Management Personnel (Parenthetical) (Detail) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of key management personnel compensation [abstract]      
Social Security contributions $ 50 $ 45 $ 55