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Expenses by Nature - Detailed Information about Expenses by Nature (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of expenses [Line Items]      
Salaries and social security taxes $ 18,403 $ 14,773 $ 11,062
Fees and compensation for services 3,839 3,212 2,457
Other personnel expenses 4,110 3,299 2,743
Taxes, charges and contributions 6,642 5,642 4,288
Royalties, easements and canons 17,692 17,178 11,977
Insurance 974 1,167 925
Rental of real estate and equipment 6,243 5,636 3,789
Survey expenses 214 501 504
Depreciation of property, plant and equipment 53,512 44,752 26,685
Amortization of intangible assets 838 717 323
Industrial inputs, consumable materials and supplies 5,956 5,859 3,921
Operation services and other service contracts 13,449 11,574 7,044
Preservation, repair and maintenance 21,126 17,423 14,825
Unproductive exploratory drillings 1,400 2,050 1,425
Transportation, products and charges 14,702 11,925 8,577
Provision for doubtful trade receivables 28 169 (99)
Publicity and advertising expenses 1,154 1,199 687
Fuel, gas, energy and miscellaneous 6,287 5,492 3,575
Total 176,569 152,568 104,708
Production costs [Member]      
Disclosure of expenses [Line Items]      
Salaries and social security taxes 12,548 10,228 7,566
Fees and compensation for services 1,159 1,037 775
Other personnel expenses 3,493 2,773 2,303
Taxes, charges and contributions 2,215 1,861 1,144
Royalties, easements and canons 17,630 17,114 11,932
Insurance 840 1,037 831
Rental of real estate and equipment 5,710 5,097 3,360
Depreciation of property, plant and equipment 51,607 43,077 25,706
Amortization of intangible assets 688 499 185
Industrial inputs, consumable materials and supplies 5,813 5,732 3,801
Operation services and other service contracts 12,033 10,494 6,261
Preservation, repair and maintenance 20,204 16,710 14,231
Transportation, products and charges 8,724 6,952 4,796
Fuel, gas, energy and miscellaneous 4,759 4,464 2,659
Total 147,423 127,075 85,550
Administrative expenses [Member]      
Disclosure of expenses [Line Items]      
Salaries and social security taxes 3,537 2,642 2,065
Fees and compensation for services 2,118 1,686 1,378
Other personnel expenses 374 347 277
Taxes, charges and contributions 255 382 259
Insurance 49 41 38
Rental of real estate and equipment 15 32 33
Depreciation of property, plant and equipment 771 714 382
Amortization of intangible assets 125 186 117
Industrial inputs, consumable materials and supplies 35 33 27
Operation services and other service contracts 268 242 237
Preservation, repair and maintenance 382 343 248
Transportation, products and charges 17 9 25
Publicity and advertising expenses 545 344 395
Fuel, gas, energy and miscellaneous 245 125 105
Total 8,736 7,126 5,586
Selling expenses [Member]      
Disclosure of expenses [Line Items]      
Salaries and social security taxes 1,988 1,615 1,207
Fees and compensation for services 544 436 280
Other personnel expenses 194 140 121
Taxes, charges and contributions 4,172 3,399 2,885
Royalties, easements and canons 31 25 17
Insurance 85 89 56
Rental of real estate and equipment 518 505 394
Depreciation of property, plant and equipment 1,134 961 597
Amortization of intangible assets 25 32 21
Industrial inputs, consumable materials and supplies 83 76 88
Operation services and other service contracts 905 713 546
Preservation, repair and maintenance 458 338 322
Transportation, products and charges 5,961 4,964 3,756
Provision for doubtful trade receivables 28 169 (99)
Publicity and advertising expenses 609 855 292
Fuel, gas, energy and miscellaneous 1,219 895 616
Total 17,954 15,212 11,099
Exploration expenses [Member]      
Disclosure of expenses [Line Items]      
Salaries and social security taxes 330 288 224
Fees and compensation for services 18 53 24
Other personnel expenses 49 39 42
Royalties, easements and canons 31 39 28
Rental of real estate and equipment   2 2
Survey expenses 214 501 504
Industrial inputs, consumable materials and supplies 25 18 5
Operation services and other service contracts 243 125  
Preservation, repair and maintenance 82 32 24
Unproductive exploratory drillings 1,400 2,050 1,425
Fuel, gas, energy and miscellaneous 64 8 195
Total $ 2,456 $ 3,155 $ 2,473