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Intangible Assets - Summary of Changes in Intangible Assets (Detail) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | $ 8,114 | $ 7,359 | $ 4,393
Ending balance | 9,976 | 8,114 | 7,359
Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 20,336 | 16,777 | 10,289
Increases | 1,153 | 888 | 1,113
Translation effect | 3,607 | 3,675 | 5,589
Decreases and reclassifications | 23 | (1,004) | (214)
Ending balance | 25,119 | 20,336 | 16,777
Accumulated amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 12,222 | 9,418 | 5,896
Increases | 838 | 717 | 323
Translation effect | 2,215 | 2,093 | 3,205
Decreases and reclassifications | (132) | (6) | (6)
Ending balance | 15,143 | 12,222 | 9,418
Service concession [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 4,514 | 3,974 | 2,232
Ending balance | 5,644 | 4,514 | 3,974
Service concession [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 11,749 | 9,527 | 5,707
Increases | 947 | 642 | 653
Translation effect | 2,141 | 2,127 | 3,218
Decreases and reclassifications | (13) | (547) | (51)
Ending balance | 14,824 | 11,749 | 9,527
Service concession [member] | Accumulated amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 7,235 | 5,553 | 3,475
Increases | 615 | 437 | 180
Translation effect | 1,330 | 1,245 | 1,904
Decreases and reclassifications |  |  | (6)
Ending balance | 9,180 | 7,235 | 5,553
Exploration rights [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 2,944 | 2,835 | 1,825
Ending balance | 3,465 | 2,944 | 2,835
Exploration rights [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 3,093 | 2,990 | 1,975
Increases | 8 | 75 | 270
Translation effect | 513 | 612 | 928
Decreases and reclassifications | (149) | (584) | (183)
Ending balance | 3,465 | 3,093 | 2,990
Exploration rights [member] | Accumulated amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 149 | 155 | 150
Translation effect |  |  | 5
Decreases and reclassifications | (149) | (6) |
Ending balance |  | 149 | 155
Other intangibles [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 656 | 550 | 336
Ending balance | 867 | 656 | 550
Other intangibles [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 5,494 | 4,260 | 2,607
Increases | 198 | 171 | 190
Translation effect | 953 | 936 | 1,443
Decreases and reclassifications | 185 | 127 | 20
Ending balance | 6,830 | 5,494 | 4,260
Other intangibles [member] | Accumulated amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 4,838 | 3,710 | 2,271
Increases | 223 | 280 | 143
Translation effect | 885 | 848 | 1,296
Decreases and reclassifications | 17 |  |
Ending balance | $ 5,963 | $ 4,838 | $ 3,710

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- Definition The increase (decrease) in intangible assets and goodwill resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in intangible assets and goodwill resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e&doctype=Standard -URIDate 2017-03-09 + Details
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