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Expenses by Nature - Detailed Information about Expenses by Nature (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of expenses [line items]      
Salaries and social security taxes $ 26,847 $ 18,403 $ 14,773
Fees and compensation for services 6,210 3,839 3,212
Other personnel expenses 6,212 4,110 3,299
Taxes, charges and contributions 9,563 6,642 5,642
Royalties, easements and canons 31,813 17,692 17,178
Insurance 1,583 974 1,167
Rental of real estate and equipment 9,801 6,243 5,636
Survey expenses 848 214 501
Depreciation of property, plant and equipment 87,569 53,512 44,752
Amortization of intangible assets 1,749 838 717
Industrial inputs, consumable materials and supplies 11,379 5,956 5,859
Operation services and other service contracts 16,676 13,449 11,574
Preservation, repair and maintenance 32,695 21,126 17,423
Unproductive exploratory drillings 3,331 1,400 2,050
Transportation, products and charges 22,333 14,702 11,925
Provision for doubtful trade receivables 353 28 169
Publicity and advertising expenses 1,929 1,154 1,199
Fuel, gas, energy and miscellaneous 10,764 6,287 5,492
Total 281,655 176,569 152,568
Production costs [Member]      
Disclosure of expenses [line items]      
Salaries and social security taxes 18,908 12,548 10,228
Fees and compensation for services 1,772 1,159 1,037
Other personnel expenses 5,313 3,493 2,773
Taxes, charges and contributions 3,634 2,215 1,861
Royalties, easements and canons 31,677 17,630 17,114
Insurance 1,335 840 1,037
Rental of real estate and equipment 8,983 5,710 5,097
Depreciation of property, plant and equipment 83,700 51,607 43,077
Amortization of intangible assets 1,497 688 499
Industrial inputs, consumable materials and supplies 11,126 5,813 5,732
Operation services and other service contracts 14,973 12,033 10,494
Preservation, repair and maintenance 31,141 20,204 16,710
Transportation, products and charges 12,714 8,724 6,952
Fuel, gas, energy and miscellaneous 7,567 4,759 4,464
Total 234,340 147,423 127,075
Administrative expenses [Member]      
Disclosure of expenses [line items]      
Salaries and social security taxes 4,867 3,537 2,642
Fees and compensation for services 3,534 2,118 1,686
Other personnel expenses 571 374 347
Taxes, charges and contributions 275 255 382
Insurance 130 49 41
Rental of real estate and equipment 24 15 32
Depreciation of property, plant and equipment 1,758 771 714
Amortization of intangible assets 222 125 186
Industrial inputs, consumable materials and supplies 59 35 33
Operation services and other service contracts 372 268 242
Preservation, repair and maintenance 620 382 343
Transportation, products and charges 4 17 9
Publicity and advertising expenses 951 545 344
Fuel, gas, energy and miscellaneous 535 245 125
Total 13,922 8,736 7,126
Selling expenses [Member]      
Disclosure of expenses [line items]      
Salaries and social security taxes 2,592 1,988 1,615
Fees and compensation for services 883 544 436
Other personnel expenses 278 194 140
Taxes, charges and contributions 5,626 4,172 3,399
Royalties, easements and canons 64 31 25
Insurance 118 85 89
Rental of real estate and equipment 766 518 505
Depreciation of property, plant and equipment 2,111 1,134 961
Amortization of intangible assets 30 25 32
Industrial inputs, consumable materials and supplies 172 83 76
Operation services and other service contracts 1,302 905 713
Preservation, repair and maintenance 886 458 338
Transportation, products and charges 9,615 5,961 4,964
Provision for doubtful trade receivables 353 28 169
Publicity and advertising expenses 978 609 855
Fuel, gas, energy and miscellaneous 2,153 1,219 895
Total 27,927 17,954 15,212
Exploration expenses [Member]      
Disclosure of expenses [line items]      
Salaries and social security taxes 480 330 288
Fees and compensation for services 21 18 53
Other personnel expenses 50 49 39
Taxes, charges and contributions 28    
Royalties, easements and canons 72 31 39
Rental of real estate and equipment 28   2
Survey expenses 848 214 501
Industrial inputs, consumable materials and supplies 22 25 18
Operation services and other service contracts 29 243 125
Preservation, repair and maintenance 48 82 32
Unproductive exploratory drillings 3,331 1,400 2,050
Fuel, gas, energy and miscellaneous 509 64 8
Total $ 5,466 $ 2,456 $ 3,155