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Provisions - Summary of Changes in Group's Provisions (Detail) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Financial Results [line items] |  |  |
Net exchange and translation differences | $ 16,025 | $ 15,287 | $ 25,625
Reclassifications and other movements | (3,203) |  | (2,373)
Non current [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance | 47,358 | 39,623 | 26,564
Increases charged to expenses | 6,823 | 5,661 | 4,765
Decreases charged to income | (1,568) | (169) | (748)
Amounts incurred due to payments/utilization | (25) | (39) |
Net exchange and translation differences | 8,357 | 7,651 | 13,058
Deconsolidation of subsidiaries |  | (4,436) |
Reclassifications and other movements | (6,211) | (933) | (4,016)
Provisions ending balance | 54,734 | 47,358 | 39,623
Non current [member] | Provision for Pending Lawsuits and Contingencies [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance | 9,205 | 10,375 | 7,014
Increases charged to expenses | 2,394 | 1,579 | 2,062
Decreases charged to income | (1,570) | (158) | (434)
Amounts incurred due to payments/utilization | (25) | 9 |
Net exchange and translation differences | 1,483 | 1,221 | 2,383
Deconsolidation of subsidiaries |  | (2,213) |
Reclassifications and other movements | 180 | (1,608) | (650)
Provisions ending balance | 11,667 | 9,205 | 10,375
Non current [member] | Provision for environmental liabilities [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance | 530 | 1,620 | 1,269
Increases charged to expenses | 1,483 | 962 | 986
Decreases charged to income | (6) |  |
Net exchange and translation differences |  | 159 | 464
Deconsolidation of subsidiaries |  | (1,351) |
Reclassifications and other movements | (811) | (860) | (1,099)
Provisions ending balance | 1,196 | 530 | 1,620
Non current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance | 37,623 | 27,380 | 18,087
Increases charged to expenses | 2,946 | 3,023 | 1,694
Decreases charged to income | 8 | (10) | (314)
Amounts incurred due to payments/utilization |  | (48) |
Net exchange and translation differences | 6,874 | 6,245 | 10,109
Deconsolidation of subsidiaries |  | (515) |
Reclassifications and other movements | (5,580) | 1,548 | (2,196)
Provisions ending balance | 41,871 | 37,623 | 27,380
Non current [member] | Provision for pending lawsuits and contingencies [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance |  | 248 | 194
Increases charged to expenses |  | 97 | 23
Decreases charged to income |  | (1) |
Net exchange and translation differences |  | 26 | 102
Deconsolidation of subsidiaries |  | (357) |
Reclassifications and other movements |  | (13) | (71)
Provisions ending balance |  |  | 248
Current [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance | 1,994 | 2,009 | 2,399
Increases charged to expenses | 83 | 367 | 95
Decreases charged to income | (408) | (335) | (154)
Amounts incurred due to payments/utilization | (1,363) | (1,705) | (1,758)
Net exchange and translation differences | 196 | 156 | 372
Increase from JO interest acquisition |  |  | (504)
Deconsolidation of subsidiaries |  | (652) |
Reclassifications and other movements | 1,940 | 2,154 | 1,559
Provisions ending balance | 2,442 | 1,994 | 2,009
Current [member] | Provision for Pending Lawsuits and Contingencies [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance | 569 | 149 | 851
Increases charged to expenses | 83 | 335 | 95
Decreases charged to income | (410) | (258) | (141)
Amounts incurred due to payments/utilization | (187) | (239) | (374)
Net exchange and translation differences | 75 | 7 | 10
Deconsolidation of subsidiaries |  | (11) |
Reclassifications and other movements | 558 | 586 | (292)
Provisions ending balance | 688 | 569 | 149
Current [member] | Provision for environmental liabilities [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance | 868 | 1,400 | 1,145
Increases charged to expenses |  | 32 |
Amounts incurred due to payments/utilization | (661) | (869) | (1,030)
Net exchange and translation differences |  | 52 | 186
Deconsolidation of subsidiaries |  | (607) |
Reclassifications and other movements | 811 | 860 | 1,099
Provisions ending balance | 1,018 | 868 | 1,400
Current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance | 557 | 429 | 376
Decreases charged to income | 2 | (77) |
Amounts incurred due to payments/utilization | (515) | (584) | (283)
Net exchange and translation differences | 121 | 94 | 159
Increase from JO interest acquisition |  |  | (504)
Reclassifications and other movements | 571 | 695 | 681
Provisions ending balance | $ 736 | 557 | 429
Current [member] | Provision for pending lawsuits and contingencies [member] |  |  |
Disclosure of Financial Results [line items] |  |  |
Provisions beginning balance |  | 31 | 27
Decreases charged to income |  |  | (13)
Amounts incurred due to payments/utilization |  | (13) | (71)
Net exchange and translation differences |  | 3 | 17
Deconsolidation of subsidiaries |  | (34) |
Reclassifications and other movements |  | $ 13 | 71
Provisions ending balance |  |  | $ 31

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- Definition The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities of uncertain timing or the amount recognised when: (a) the entity has a present obligation (legal or constructive) as a result of a past event; (b) it is probable (ie more likely than not) that an outflow of resources embodying economic benefits will be required to settle the obligation; and (c) a reliable estimate can be made of the amount of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_l&doctype=Standard -URIDate 2017-03-09 + Details
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