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Intangible Assets - Summary of Changes in Intangible Assets (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance $ 37,608 $ 20,402 $ 9,976
Ending balance 41,245 37,608 20,402
Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 92,894 53,331 25,119
Increases 2,634 6,147 2,344
Translation effect 36,509 32,511 25,594
Adjustment for inflation 1,070 833 591
Decreases and reclassifications (10,144) 72 (317)
Ending balance 122,963 92,894 53,331
Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 55,286 32,929 15,143
Increases 3,428 2,374 1,749
Translation effect 22,753 19,807 15,983
Adjustment for inflation 251 199 58
Decreases and reclassifications   (23) (4)
Ending balance 81,718 55,286 32,929
Service concession [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 17,646 11,592 5,644
Ending balance 22,853 17,646 11,592
Service concession [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 51,936 31,702 14,824
Increases 1,049 1,271 1,303
Translation effect 21,213 18,969 15,544
Decreases and reclassifications (1) (6) 31
Ending balance 74,197 51,936 31,702
Service concession [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 34,290 20,110 9,180
Increases 2,659 1,848 1,190
Translation effect 14,395 12,332 9,740
Ending balance 51,344 34,290 20,110
Exploration rights [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 16,655 6,907 3,465
Ending balance 13,436 16,655 6,907
Exploration rights [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 16,655 6,907 3,465
Increases 715 4,171 276
Translation effect 6,528 5,680 3,414
Decreases and reclassifications (10,462) (103) (248)
Ending balance 13,436 16,655 6,907
Other intangibles [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 3,307 1,903 867
Ending balance 4,956 3,307 1,903
Other intangibles [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 24,303 14,722 6,830
Increases 870 705 765
Translation effect 8,768 7,862 6,636
Adjustment for inflation 1,070 833 591
Decreases and reclassifications 319 181 (100)
Ending balance 35,330 24,303 14,722
Other intangibles [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 20,996 12,819 5,963
Increases 769 526 559
Translation effect 8,358 7,475 6,243
Adjustment for inflation 251 199 58
Decreases and reclassifications   (23) (4)
Ending balance $ 30,374 $ 20,996 $ 12,819