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Property Plant and Equipment - Summary of Changes in Property Plant and Equipment (Detail) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | $ 308,014 | $ 270,905 |
Amount at end of year | 354,443 | 308,014 | $ 270,905
Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 868,411 | 668,198 | 392,399
Increases | 53,096 | 65,048 | 59,880
Translation effect | 154,172 | 147,534 | 222,903
Decreases and reclassifications | (13,624) | (12,369) | (6,984)
Amount at end of year | 1,062,055 | 868,411 | 668,198
Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 522,732 | 394,076 | 235,156
Increases | 63,467 | 47,629 | 26,685
Translation effect | 97,034 | 88,101 | 132,743
Decreases and reclassifications | (3,808) | (7,074) | (508)
Amount at end of year | 679,425 | 522,732 | 394,076
Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 345,679 | 274,122 | 157,243
Amount at end of year | 382,630 | 345,679 | 274,122
Land and Buildings [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 18,429 | 13,949 | 9,084
Increases | 49 | 140 | 23
Translation effect | 3,028 | 2,975 | 4,630
Decreases and reclassifications | (112) | 1,365 | 212
Amount at end of year | 21,394 | 18,429 | 13,949
Land and Buildings [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 7,497 | 5,920 | 3,779
Increases | 437 | 360 | 211
Translation effect | 1,303 | 1,257 | 1,934
Decreases and reclassifications | 13 | (40) | (4)
Amount at end of year | 9,250 | 7,497 | 5,920
Land and Buildings [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 10,932 | 8,029 | 5,305
Amount at end of year | 12,144 | 10,932 | 8,029
Mineral Property, Wells and Related Equipment [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 625,628 | 458,066 | 265,376
Increases | (4,370) | 3,831 | (1,140)
Translation effect | 113,481 | 104,086 | 155,844
Decreases and reclassifications | 40,614 | 59,645 | 37,986
Amount at end of year | 775,353 | 625,628 | 458,066
Mineral Property, Wells and Related Equipment [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 432,002 | 324,922 | 192,170
Increases | 54,980 | 40,729 | 22,884
Translation effect | 81,108 | 73,288 | 110,301
Decreases and reclassifications | (1,756) | (6,937) | (433)
Amount at end of year | 566,334 | 432,002 | 324,922
Mineral Property, Wells and Related Equipment [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 193,626 | 133,144 | 73,206
Amount at end of year | 209,019 | 193,626 | 133,144
Refinery equipment and petrochemical plants [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 112,560 | 69,429 | 42,081
Increases | 103 | 1 | 7
Translation effect | 19,728 | 16,601 | 23,707
Decreases and reclassifications | 2,284 | 26,529 | 3,634
Amount at end of year | 134,675 | 112,560 | 69,429
Refinery equipment and petrochemical plants [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 54,735 | 41,138 | 24,842
Increases | 5,395 | 4,312 | 2,289
Translation effect | 9,983 | 9,288 | 14,019
Decreases and reclassifications | (953) | (3) | (12)
Amount at end of year | 69,160 | 54,735 | 41,138
Refinery equipment and petrochemical plants [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 57,825 | 28,291 | 17,239
Amount at end of year | 65,515 | 57,825 | 28,291
Transportation equipment [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 5,551 | 3,650 | 2,160
Increases | 66 | 3 | 5
Translation effect | 1,032 | 802 | 1,155
Decreases and reclassifications | 965 | 1,096 | 330
Amount at end of year | 7,614 | 5,551 | 3,650
Transportation equipment [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 3,285 | 2,392 | 1,455
Increases | 602 | 414 | 218
Translation effect | 609 | 516 | 773
Decreases and reclassifications | 16 | (37) | (54)
Amount at end of year | 4,512 | 3,285 | 2,392
Transportation equipment [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 2,266 | 1,258 | 705
Amount at end of year | 3,102 | 2,266 | 1,258
Materials and equipment in warehouse [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 14,239 | 13,478 | 8,241
Increases | 7,394 | 6,968 | 7,823
Translation effect | 2,101 | 2,494 | 4,432
Decreases and reclassifications | (7,741) | (8,701) | (7,018)
Amount at end of year | 15,993 | 14,239 | 13,478
Materials and equipment in warehouse [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 14,239 | 13,478 | 8,241
Amount at end of year | 15,993 | 14,239 | 13,478
Drilling and work in progress [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 52,673 | 76,803 | 45,051
Increases | 47,453 | 52,610 | 50,139
Translation effect | 8,568 | 14,602 | 24,005
Decreases and reclassifications | (49,165) | (91,342) | (42,392)
Amount at end of year | 59,529 | 52,673 | 76,803
Drilling and work in progress [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 52,673 | 76,803 | 45,051
Amount at end of year | 59,529 | 52,673 | 76,803
Exploratory Drilling in Progress [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 1,978 | 3,647 | 1,781
Increases | 2,207 | 1,392 | 2,767
Translation effect | 373 | 626 | 992
Decreases and reclassifications | (1,687) | (3,687) | (1,893)
Amount at end of year | 2,871 | 1,978 | 3,647
Exploratory Drilling in Progress [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 1,978 | 3,647 | 1,781
Amount at end of year | 2,871 | 1,978 | 3,647
Furniture Fixture and Installations [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 8,089 | 5,603 | 3,314
Increases | 20 | 25 | 36
Translation effect | 1,466 | 1,260 | 1,865
Decreases and reclassifications | 879 | 1,201 | 388
Amount at end of year | 10,454 | 8,089 | 5,603
Furniture Fixture and Installations [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 6,401 | 4,699 | 2,817
Increases | 717 | 668 | 323
Translation effect | 1,196 | 1,052 | 1,559
Decreases and reclassifications | 372 | (18) |
Amount at end of year | 8,686 | 6,401 | 4,699
Furniture Fixture and Installations [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 1,688 | 904 | 497
Amount at end of year | 1,768 | 1,688 | 904
Selling equipment [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 14,346 | 10,778 | 5,520
Increases |  |  | 1
Translation effect | 2,744 | 2,430 | 3,640
Decreases and reclassifications | 1,698 | 1,138 | 1,617
Amount at end of year | 18,788 | 14,346 | 10,778
Selling equipment [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 9,119 | 6,921 | 4,215
Increases | 854 | 642 | 345
Translation effect | 1,684 | 1,558 | 2,361
Decreases and reclassifications | (1) | (2) |
Amount at end of year | 11,656 | 9,119 | 6,921
Selling equipment [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 5,227 | 3,857 | 1,305
Amount at end of year | 7,132 | 5,227 | 3,857
Infrastructure for Natural Gas Distribution [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 3,191 | 2,931 | 2,722
Decreases and reclassifications | 215 | 260 | 209
Amount at end of year | 3,406 | 3,191 | 2,931
Infrastructure for Natural Gas Distribution [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 1,301 | 1,181 | 1,116
Increases | 80 | 75 | 68
Decreases and reclassifications |  | 45 | (3)
Amount at end of year | 1,381 | 1,301 | 1,181
Infrastructure for Natural Gas Distribution [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 1,890 | 1,750 | 1,606
Amount at end of year | 2,025 | 1,890 | 1,750
Electric Power Generation Facilities [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 1,762 | 1,573 | 1,567
Increases |  | 2 |
Decreases and reclassifications | (1,762) | 187 | 6
Amount at end of year |  | 1,762 | 1,573
Electric Power Generation Facilities [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 1,394 | 1,283 | 1,171
Increases | 87 | 111 | 112
Decreases and reclassifications | (1,481) |  |
Amount at end of year |  | 1,394 | 1,283
Electric Power Generation Facilities [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 368 | 290 | 396
Amount at end of year |  | 368 | 290
Other Property [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 9,965 | 8,291 | 5,502
Increases | 174 | 76 | 219
Translation effect | 1,651 | 1,658 | 2,633
Decreases and reclassifications | 188 | (60) | (63)
Amount at end of year | 11,978 | 9,965 | 8,291
Other Property [member] | Accumulated Depreciation and Amortization [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 6,998 | 5,620 | 3,591
Increases | 315 | 318 | 235
Translation effect | 1,151 | 1,142 | 1,796
Decreases and reclassifications | (18) | (82) | (2)
Amount at end of year | 8,446 | 6,998 | 5,620
Other Property [member] | Net book value of property, plant and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Amount at beginning of year | 2,967 | 2,671 | 1,911
Amount at end of year | $ 3,532 | $ 2,967 | $ 2,671

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