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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Summary of Standardized Measure of Discounted Future Net Cash Flows (Detail) - ARS ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of discounted future net cash flow [Line Items]        
Total standardized measure of discounted future net cash flows $ 66,433 $ 106,411 $ 97,765 $ 99,383
Argentina [member]        
Disclosure of discounted future net cash flow [Line Items]        
Future cash inflows 564,396 669,791 670,085  
Future production costs (349,819) (379,757) (395,119)  
Future development costs (128,885) (120,862) (116,524)  
Future income tax expenses (2,324) (29,956) (30,724)  
10% annual discount for estimated timing of cash flows (16,935) (32,805) (30,075)  
Total standardized measure of discounted future net cash flows 66,433 106,411 97,643  
Other foreign [Member]        
Disclosure of discounted future net cash flow [Line Items]        
Future cash inflows     589  
Future production costs     (331)  
Future development costs     (10)  
Future income tax expenses     (70)  
10% annual discount for estimated timing of cash flows     (56)  
Total standardized measure of discounted future net cash flows     122  
Worldwide [Member]        
Disclosure of discounted future net cash flow [Line Items]        
Future cash inflows 564,396 669,791 670,674  
Future production costs (349,819) (379,757) (395,450)  
Future development costs (128,885) (120,862) (116,534)  
Future income tax expenses (2,324) (29,956) (30,794)  
10% annual discount for estimated timing of cash flows (16,935) (32,805) (30,131)  
Total standardized measure of discounted future net cash flows $ 66,433 $ 106,411 $ 97,765