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Segment Information - Summary of Segment Informations (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Revenues from sales $ 435,820 $ 252,813 $ 210,100
Revenues 435,820 252,813 210,100
Operating profit / (loss) 43,780 16,073 (24,246)
Income / (loss) from equity interests in associates and joint ventures 4,839 1,428 588
Depreciation of property, plant and equipment 87,569 53,512 44,752
Recovery of property, plant and equipment 2,900 5,032  
Impairment of property, plant and equipment and intangible assets     34,943
Acquisition of property, plant and equipment 83,648 53,096 65,048
Assets 994,016 505,718 421,139
Operating segments [member] | Upstream [member]      
Disclosure of operating segments [line items]      
Revenues from sales 3,108 739 18,745
Revenues from intersegment sales 207,480 115,955 95,398
Revenues 210,588 116,694 114,143
Operating profit / (loss) 22,483 3,877 (26,845)
Income / (loss) from equity interests in associates and joint ventures     (1)
Depreciation of property, plant and equipment 72,052 45,279 38,125
Recovery of property, plant and equipment 2,900 5,032  
Impairment of property, plant and equipment and intangible assets     34,943
Acquisition of property, plant and equipment 63,171 39,411 51,396
Assets 480,263 251,525 236,173
Operating segments [member] | Gas and power segment [member]      
Disclosure of operating segments [line items]      
Revenues from sales 91,176 56,805 26,514
Revenues from intersegment sales 7,862 4,075 3,212
Revenues 99,038 60,880 29,726
Operating profit / (loss) 16,786 3,259 2,008
Income / (loss) from equity interests in associates and joint ventures 4,435 634 302
Depreciation of property, plant and equipment 928 290 290
Acquisition of property, plant and equipment 1,968 3,867 2,134
Assets 129,885 45,395 25,866
Operating segments [member] | Downstream [member]      
Disclosure of operating segments [line items]      
Revenues from sales 338,042 195,321 162,538
Revenues from intersegment sales 1,688 988 925
Revenues 339,730 196,309 163,463
Operating profit / (loss) 7,818 15,813 3,093
Income / (loss) from equity interests in associates and joint ventures 404 794 287
Depreciation of property, plant and equipment 12,285 6,926 5,507
Acquisition of property, plant and equipment 15,632 8,179 9,839
Assets 307,312 158,800 125,536
Operating segments [member] | Central Administration and Others [member]      
Disclosure of operating segments [line items]      
Revenues from sales 8,363 2,534 2,303
Revenues from intersegment sales 13,186 7,133 7,447
Revenues 21,549 9,667 9,750
Operating profit / (loss) (6,055) (4,400) (1,615)
Depreciation of property, plant and equipment 2,304 1,017 830
Acquisition of property, plant and equipment 2,877 1,639 1,679
Assets 82,762 53,934 34,739
Consolidation Adjustments [member]      
Disclosure of operating segments [line items]      
Revenues from sales (4,869) (2,586)  
Revenues from intersegment sales (230,216) (128,151) (106,982)
Revenues (235,085) (130,737) (106,982)
Operating profit / (loss) 2,748 (2,476) (887)
Assets $ (6,206) $ (3,936) $ (1,175)