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Segment Information - Summary of Segment Informations (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Revenues from sales $ 669,186 $ 678,595 $ 435,820
Revenues 669,186 678,595 435,820
Operating profit / (loss) (58,397) (21,012) 43,780
Income from equity interests in associates and joint ventures 13,270 7,968 4,839
Depreciation of property, plant and equipment 171,452 145,894 87,569
(Recovery) of property, plant and equipment     (2,900)
(Recovery) / Impairment of property, plant and equipment and intangible assets, net (6,851) 41,429  
Acquisition of property, plant and equipment 96,278 (172,844) 83,648
Assets 1,923,225 1,573,289 994,016
Operating segments [member] | Upstream [member]      
Disclosure of operating segments [line items]      
Revenues from sales 2,419 2,046 3,108
Revenues from intersegment sales 289,421 286,585 207,480
Revenues 291,840 288,631 210,588
Operating profit / (loss) (25,878) (49,194) 22,483
Depreciation of property, plant and equipment 128,132 119,821 72,052
(Recovery) of property, plant and equipment     (2,900)
(Recovery) / Impairment of property, plant and equipment and intangible assets, net (7,475) 40,561  
Acquisition of property, plant and equipment 63,071 (136,589) 63,171
Assets 914,257 742,850 480,263
Operating segments [member] | Gas and power segment [member]      
Disclosure of operating segments [line items]      
Revenues from sales 122,254 131,055 91,176
Revenues from intersegment sales 8,060 8,697 7,862
Revenues 130,314 139,752 99,038
Operating profit / (loss) (18,994) 2,944 16,786
Income from equity interests in associates and joint ventures 9,199 5,339 4,435
Depreciation of property, plant and equipment 1,858 1,378 928
(Recovery) / Impairment of property, plant and equipment and intangible assets, net 527 868  
Acquisition of property, plant and equipment 4,905 (6,170) 1,968
Assets 209,225 199,357 129,885
Operating segments [member] | Downstream [member]      
Disclosure of operating segments [line items]      
Revenues from sales 536,714 531,724 338,042
Revenues from intersegment sales 3,349 3,447 1,688
Revenues 540,063 535,171 339,730
Operating profit / (loss) 4,839 40,653 7,818
Income from equity interests in associates and joint ventures 4,071 2,629 404
Depreciation of property, plant and equipment 34,295 20,805 12,285
Acquisition of property, plant and equipment 23,420 (22,455) 15,632
Assets 646,589 508,026 307,312
Operating segments [member] | Central Administration and Others [member]      
Disclosure of operating segments [line items]      
Revenues from sales 14,108 19,743 8,363
Revenues from intersegment sales 28,787 27,502 13,186
Revenues 42,895 47,245 21,549
Operating profit / (loss) (22,305) (15,866) (6,055)
Depreciation of property, plant and equipment 7,167 3,890 2,304
(Recovery) / Impairment of property, plant and equipment and intangible assets, net 97    
Acquisition of property, plant and equipment 4,882 (7,630) 2,877
Assets 152,816 129,331 82,762
Consolidation Adjustments [member]      
Disclosure of operating segments [line items]      
Revenues from sales (6,309) (5,973) (4,869)
Revenues from intersegment sales (329,617) (326,231) (230,216)
Revenues (335,926) (332,204) (235,085)
Operating profit / (loss) 3,941 451 2,748
Assets $ 338 $ (6,275) $ (6,206)