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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Future Net Cash Flow [Abstract]      
Beginning of year $ 66,433 $ 106,411 $ 97,765
Sales and transfers, net of production costs (62,115) (53,759) (52,025)
Net change in sales and transfer prices, net of future production costs 68,651 (74,046) (37,336)
Changes in reserves and production rates (timing) 111,137 15,495 4,385
Net changes for extensions, discoveries and improved recovery 160,784 28,489 40,565
Net change due to purchases and sales of minerals in place (730)   3,234
Changes in estimated future development and abandonment costs (71,368) (32,052) (19,356)
Development costs incurred during the year that reduced future development costs 39,780 22,475 28,689
Accretion of discount 11,490 9,724 10,652
Net change in income taxes (80,832) 25,920 8,522
Others 65,003 17,776 21,316
End of year $ 308,233 $ 66,433 $ 106,411