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Intangible Assets - Summary of Changes in Intangible Assets (Detail) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | $ 9,976 | $ 8,114 | $ 7,359
Ending balance | 20,402 | 9,976 | 8,114
Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 25,119 | 20,336 | 16,777
Increases | 2,344 | 1,153 | 888
Translation effect | 25,594 | 3,607 | 3,675
Adjustment for inflation | 591 |  |
Decreases and reclassifications | (317) | 23 | (1,004)
Ending balance | 53,331 | 25,119 | 20,336
Accumulated amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 15,143 | 12,222 | 9,418
Increases | 1,749 | 838 | 717
Translation effect | 15,983 | 2,215 | 2,093
Adjustment for inflation | 58 |  |
Decreases and reclassifications | (4) | (132) | (6)
Ending balance | 32,929 | 15,143 | 12,222
Service concession [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 5,644 | 4,514 | 3,974
Ending balance | 11,592 | 5,644 | 4,514
Service concession [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 14,824 | 11,749 | 9,527
Increases | 1,303 | 947 | 642
Translation effect | 15,544 | 2,141 | 2,127
Decreases and reclassifications | 31 | (13) | (547)
Ending balance | 31,702 | 14,824 | 11,749
Service concession [member] | Accumulated amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 9,180 | 7,235 | 5,553
Increases | 1,190 | 615 | 437
Translation effect | 9,740 | 1,330 | 1,245
Ending balance | 20,110 | 9,180 | 7,235
Exploration rights [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 3,465 | 2,944 | 2,835
Ending balance | 6,907 | 3,465 | 2,944
Exploration rights [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 3,465 | 3,093 | 2,990
Increases | 276 | 8 | 75
Translation effect | 3,414 | 513 | 612
Decreases and reclassifications | (248) | (149) | (584)
Ending balance | 6,907 | 3,465 | 3,093
Exploration rights [member] | Accumulated amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance |  | 149 | 155
Decreases and reclassifications |  | (149) | (6)
Ending balance |  |  | 149
Other intangibles [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 867 | 656 | 550
Ending balance | 1,903 | 867 | 656
Other intangibles [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 6,830 | 5,494 | 4,260
Increases | 765 | 198 | 171
Translation effect | 6,636 | 953 | 936
Adjustment for inflation | 591 |  |
Decreases and reclassifications | (100) | 185 | 127
Ending balance | 14,722 | 6,830 | 5,494
Other intangibles [member] | Accumulated amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Beginning balance | 5,963 | 4,838 | 3,710
Increases | 559 | 223 | 280
Translation effect | 6,243 | 885 | 848
Adjustment for inflation | 58 |  |
Decreases and reclassifications | (4) | 17 |
Ending balance | $ 12,819 | $ 5,963 | $ 4,838

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