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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Future Net Cash Flow [Abstract]      
Beginning of year $ 380,909 $ 308,233 $ 66,433
Sales and transfers, net of production costs (176,237) (197,278) (62,115)
Net change in sales and transfer prices, net of future production costs (401,237) (239,226) 68,651
Changes in reserves and production rates (timing) (26,428) (26,496) 111,137
Net changes for extensions, discoveries and improved recovery 120,070 228,354 160,784
Net change due to purchases and sales of minerals in place (19,624) (1,152) (730)
Changes in estimated future development and abandonment costs (104,300) (82,799) (71,368)
Development costs incurred during the year that reduced future development costs 94,505 102,784 39,780
Accretion of discount 48,400 43,534 11,490
Net change in income taxes 106,148 66,705 (80,832)
Others 157,072 178,250 65,003
End of year $ 179,278 $ 380,909 $ 308,233