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Segment Information - Summary of Segment Informations (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Revenues from sales $ 252,813 $ 210,100 $ 156,136
Revenues 252,813 210,100 156,136
Operating profit / (loss) 16,073 (24,246) 16,588
Income / (loss) from equity interests in associates and joint ventures 1,428 588 318
Depreciation of property, plant and equipment 53,512 44,752 26,685
Recovery of property, plant and equipment and intangible assets 5,032    
Impairment of property, plant and equipment and intangible assets   34,943 2,535
Acquisition of property, plant and equipment 53,096 65,048 59,880
Assets 505,718 421,139 363,453
Operating segments [member] | Upstream [member]      
Disclosure of operating segments [line items]      
Revenues from sales 739 18,745 16,044
Revenues from intersegment sales 115,955 95,398 64,243
Revenues 116,694 114,143 80,287
Operating profit / (loss) 3,877 (26,845) 7,535
Income / (loss) from equity interests in associates and joint ventures   (1)  
Depreciation of property, plant and equipment 45,279 38,125 23,075
Recovery of property, plant and equipment and intangible assets 5,032    
Impairment of property, plant and equipment and intangible assets   34,943 2,535
Acquisition of property, plant and equipment 39,411 51,396 48,598
Assets 251,525 236,173 223,035
Operating segments [member] | Gas and power segment [member]      
Disclosure of operating segments [line items]      
Revenues from sales 56,805 26,514 14,003
Revenues from intersegment sales 4,075 3,212 2,184
Revenues 60,880 29,726 16,187
Operating profit / (loss) 3,259 2,008 1,498
Income / (loss) from equity interests in associates and joint ventures 634 302 267
Depreciation of property, plant and equipment 290 290 255
Acquisition of property, plant and equipment 3,867 2,134 469
Assets 45,395 25,866 13,659
Operating segments [member] | Downstream [member]      
Disclosure of operating segments [line items]      
Revenues from sales 195,321 162,538 124,959
Revenues from intersegment sales 988 925 807
Revenues 196,309 163,463 125,766
Operating profit / (loss) 15,813 3,093 6,948
Income / (loss) from equity interests in associates and joint ventures 794 287 51
Depreciation of property, plant and equipment 6,926 5,507 2,913
Acquisition of property, plant and equipment 8,179 9,839 8,874
Assets 158,800 125,536 100,146
Operating segments [member] | Central Administration and Others [member]      
Disclosure of operating segments [line items]      
Revenues from sales 2,534 2,303 1,130
Revenues from intersegment sales 7,133 7,447 6,182
Revenues 9,667 9,750 7,312
Operating profit / (loss) (4,400) (1,615) (2,331)
Depreciation of property, plant and equipment 1,017 830 442
Acquisition of property, plant and equipment 1,639 1,679 1,939
Assets 53,934 34,739 26,708
Consolidation Adjustments [member]      
Disclosure of operating segments [line items]      
Revenues from sales (2,586)    
Revenues from intersegment sales (128,151) (106,982) (73,416)
Revenues (130,737) (106,982) (73,416)
Operating profit / (loss) (2,476) (887) 2,938
Assets $ (3,936) $ (1,175) $ (95)