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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Future Net Cash Flow [Abstract]      
Beginning of year $ 179,278 $ 380,909 $ 308,233
Sales and transfers, net of production costs (87,203) (176,237) (197,278)
Net change in sales and transfer prices, net of future production costs 348,474 (401,237) (239,226)
Changes in reserves and production rates (timing) 514,410 (26,428) (26,496)
Net changes for extensions, discoveries and improved recovery 341,578 120,070 228,354
Net change due to purchases and sales of minerals in place   (19,624) (1,152)
Changes in estimated future development and abandonment costs (199,745) (104,300) (82,799)
Development costs incurred during the year that reduced future development costs 101,572 94,505 102,784
Accretion of discount 24,692 48,400 43,534
Net change in income taxes (334,063) 106,148 66,705
Others 40,206 157,072 178,250
End of year $ 929,199 $ 179,278 $ 380,909