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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
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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

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in sales and transfer prices and in production (lifting) costs related to future production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 + Details
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