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Provisions - Summary of Changes in Group's Provisions (Parenthetical) (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Financial Results [line items]      
Liabilities associated to assets held for disposal $ 4,193 $ 0 $ 0
Tax claims reclassified to taxes payable   (75)  
Maxus Entities' agreements   2,932  
Hydrocarbon Wells Abandonmnet Cost [member]      
Disclosure of Financial Results [line items]      
Abandonment of hydrocarbon well obligation costs (4,913) 2,243 (1,281)
Liabilities associated to assets held for disposal (96)    
Hydrocarbon Wells Abandonmnet Cost [member] | Magallanes area [member]      
Disclosure of Financial Results [line items]      
Abandonment of hydrocarbon well obligation costs   (8) (226)
Hydrocarbon Wells Abandonmnet Cost [member] | Puesto Cortadera [member]      
Disclosure of Financial Results [line items]      
Abandonment of hydrocarbon well obligation costs     $ (8)
Other liabilities [member]      
Disclosure of Financial Results [line items]      
Other liabilities of contractual claims $ (2,098) $ (950)