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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