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Segment Information - Summary of Segment Informations (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Revenues from sales $ 1,271,330 $ 669,186 $ 678,595
Revenues 1,271,330 669,186 678,595
Operating profit / (loss) 58,170 (58,397) (21,012)
Income from equity interests in associates and joint ventures 26,977 13,270 7,968
Depreciation of property, plant and equipment 267,686 171,452 145,894
(Recovery) / Impairment of property, plant and equipment and intangible assets, net 11,258 (6,851) 41,429
Acquisition of property, plant and equipment 259,988 96,278 172,844
Assets 2,390,068 1,923,225 1,573,289
Operating segments [member] | Upstream [member]      
Disclosure of operating segments [line items]      
Revenues from sales 4,678 2,419 2,046
Revenues from intersegment sales 544,384 289,421 286,585
Revenues 549,062 291,840 288,631
Operating profit / (loss) 1,688 (25,878) (49,194)
Depreciation of property, plant and equipment 213,495 128,132 119,821
(Recovery) / Impairment of property, plant and equipment and intangible assets, net 11,258 (7,475) 40,561
Acquisition of property, plant and equipment 210,186 63,071 136,589
Assets 1,075,503 914,257 742,850
Operating segments [member] | Gas and power segment [member]      
Disclosure of operating segments [line items]      
Revenues from sales 199,612 122,254 131,055
Revenues from intersegment sales 15,375 8,060 8,697
Revenues 214,987 130,314 139,752
Operating profit / (loss) 1,333 (18,994) 2,944
Income from equity interests in associates and joint ventures 12,738 9,199 5,339
Depreciation of property, plant and equipment 2,810 1,858 1,378
(Recovery) / Impairment of property, plant and equipment and intangible assets, net   527 868
Acquisition of property, plant and equipment 2,775 4,905 6,170
Assets 266,056 209,225 199,357
Operating segments [member] | Downstream [member]      
Disclosure of operating segments [line items]      
Revenues from sales 1,046,089 536,714 531,724
Revenues from intersegment sales 6,121 3,349 3,447
Revenues 1,052,210 540,063 535,171
Operating profit / (loss) 86,496 4,839 40,653
Income from equity interests in associates and joint ventures 14,239 4,071 2,629
Depreciation of property, plant and equipment 43,413 34,295 20,805
Acquisition of property, plant and equipment 39,942 23,420 22,455
Assets 879,985 646,589 508,026
Operating segments [member] | Central Administration and Others [member]      
Disclosure of operating segments [line items]      
Revenues from sales 31,948 14,108 19,743
Revenues from intersegment sales 48,498 28,787 27,502
Revenues 80,446 42,895 47,245
Operating profit / (loss) (18,625) (22,305) (15,866)
Depreciation of property, plant and equipment 7,968 7,167 3,890
(Recovery) / Impairment of property, plant and equipment and intangible assets, net   97  
Acquisition of property, plant and equipment 7,085 4,882 7,630
Assets 182,180 152,816 129,331
Consolidation Adjustments [member]      
Disclosure of operating segments [line items]      
Revenues from sales (10,997) (6,309) (5,973)
Revenues from intersegment sales (614,378) (329,617) (326,231)
Revenues (625,375) (335,926) (332,204)
Operating profit / (loss) (12,722) 3,941 451
Assets $ (13,656) $ 338 $ (6,275)