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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Summary of Changes in the Standardized Measure of Discounted Future Net Cash Flows (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Future Net Cash Flow [Abstract]      
Beginning of year $ 106,411 $ 97,765 $ 99,383
Sales and transfers, net of production costs (53,759) (52,025) (52,321)
Net change in sales and transfer prices, net of future production costs (74,046) (37,336) (80,809)
Changes in reserves and production rates (timing) 15,495 4,385 3,748
Net changes for extensions, discoveries and improved recovery 28,489 40,565 30,956
Net change due to purchases and sales of minerals in place   3,234  
Changes in estimated future development and abandonment costs (32,052) (19,356) (28,225)
Development costs incurred during the year that reduced future development costs 22,475 28,689 24,475
Accretion of discount 9,724 10,652 13,646
Net change in income taxes 25,920 8,522 35,409
Others 17,775 21,316 51,503
End of year $ 66,433 $ 106,411 $ 97,765