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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)

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