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Supplemental Information on Oil and Gas Producing Activities (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Statement [LineItems] |
Summary of Capitalized Costs, Along with the related Accumulated Depreciation and Allowances | The following tables set forth capitalized costs, along with the related accumulated depreciation and allowances as of December 31, 2018, 2017 and 2016:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Consolidated capitalized costs |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |
Proved oil and gas properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mineral property, wells and related equipment |  |  | 1,594,064 |  |  |  | — |  |  |  | 1,594,064 |  |  |  | 770,461 |  |  |  | — |  |  |  | 770,461 |  |  |  | 621,717 |  |  |  | — |  |  |  | 621,717 |
Support equipment and facilities |  |  | 47,224 |  |  |  | — |  |  |  | 47,224 |  |  |  | 22,171 |  |  |  | — |  |  |  | 22,171 |  |  |  | 18,263 |  |  |  | — |  |  |  | 18,263 |
Drilling and work in progress |  |  | 80,737 |  |  |  | — |  |  |  | 80,737 |  |  |  | 40,567 |  |  |  | — |  |  |  | 40,567 |  |  |  | 36,966 |  |  |  | — |  |  |  | 36,966 |
Unproved oil and gas properties |  |  | 14,909 |  |  |  | 1,241 |  |  |  | 16,150 |  |  |  | 6,189 |  |  |  | 558 |  |  |  | 6,747 |  |  |  | 4,788 |  |  |  | 526 |  |  |  | 5,314 |
Total capitalized costs |  |  | 1,736,933 |  |  |  | 1,241 |  |  |  | 1,738,174 |  |  |  | 839,388 |  |  |  | 558 |  |  |  | 839,946 |  |  |  | 681,734 |  |  |  | 526 |  |  |  | 682,260 |
Accumulated depreciation and valuation allowances |  |  | (1,283,840 | ) |  |  | (489 | ) |  |  | (1,284,328 | ) |  |  | (600,086 | ) |  |  | — |  |  |  | (600,086 | ) |  |  | (473,814 | ) |  |  | — |  |  |  | (473,814 | )
Net capitalized costs |  |  | 453,093 |  |  |  | 752 |  |  |  | 453,846 |  |  |  | 239,302 |  |  |  | 558 |  |  |  | 239,860 |  |  |  | 207,920 |  |  |  | 526 |  |  |  | 208,446 |
Costs Incurred for Oil and Gas Producing Activities | The following tables set forth the costs incurred for oil and gas producing activities during the years ended December 31, 2018, 2017 and 2016:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Consolidated costs incurred |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |
Acquisition of unproved properties |  |  | 276 |  |  |  | — |  |  |  | 276 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Acquisition of proved properties |  |  | 166 |  |  |  | — |  |  |  | 166 |  |  |  | 154 |  |  |  | — |  |  |  | 154 |  |  |  | 2,093 |  |  |  | — |  |  |  | 2,093 |
Exploration costs |  |  | 7,283 |  |  |  | 381 |  |  |  | 7,664 |  |  |  | 3,302 |  |  |  | 149 |  |  |  | 3,451 |  |  |  | 2,922 |  |  |  | 517 |  |  |  | 3,439 |
Development costs |  |  | 53,553 |  |  |  | — |  |  |  | 53.553 |  |  |  | 39,039 |  |  |  | — |  |  |  | 39,039 |  |  |  | 49,302 |  |  |  | 25 |  |  |  | 49,327 |
Total costs incurred |  |  | 61,278 |  |  |  | 381 |  |  |  | 61,659 |  |  |  | 42,495 |  |  |  | 149 |  |  |  | 42,644 |  |  |  | 54,317 |  |  |  | 542 |  |  |  | 54,859 |
Results of Operations from Oil and Gas Producing Activities | Differences between these tables and the amounts shown in Note 5 “Segment information”, for the exploration and production business unit, relate to additional operations that do not arise from those properties held by the Group.
|  | 2018 |  |  | 2017 |  |  | 2016 |
Consolidated results of operations |  | Argentina |  |  | Other Foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |
Net sales to unaffiliated parties |  |  | 3,085 |  |  |  | — |  |  |  | 3,085 |  |  |  | 521 |  |  |  | — |  |  |  | 521 |  |  |  | 18,489 |  |  |  | 98 |  |  |  | 18,587 |
Net intersegment sales |  |  | 207,480 |  |  |  | — |  |  |  | 207,480 |  |  |  | 115,955 |  |  |  | — |  |  |  | 115,955 |  |  |  | 95,496 |  |  |  | — |  |  |  | 95,496 |
Total net revenues |  |  | 210,565 |  |  |  | — |  |  |  | 210,565 |  |  |  | 116,476 |  |  |  | — |  |  |  | 116,476 |  |  |  | 113,985 |  |  |  | 98 |  |  |  | 114,083 |
Production costs |  |  | (114,381 | ) |  |  | — |  |  |  | (114,381 | ) |  |  | (69,944 | ) |  |  | — |  |  |  | (69,944 | ) |  |  | (65,823 | ) |  |  | (39 | ) |  |  | (65,862 | )
Exploration expenses |  |  | (5,185 | ) |  |  | (224 | ) |  |  | (5,409 | ) |  |  | (2,279 | ) |  |  | (168 | ) |  |  | (2,447 | ) |  |  | (3,140 | ) |  |  | (17 | ) |  |  | (3,157 | )
Depreciation and expense for valuation allowances |  |  | (72,044 | ) |  |  | — |  |  |  | (72,044 | ) |  |  | (45,277 | ) |  |  | — |  |  |  | (45,277 | ) |  |  | (38,036 | ) |  |  | (90 | ) |  |  | (38,126 | )
Impairment of Property, plan and equipment |  |  | 3,265 |  |  |  | (365 | ) |  |  | 2,900 |  |  |  | 5,032 |  |  |  | — |  |  |  | 5,032 |  |  |  | (34,943 | ) |  |  | — |  |  |  | (34,943 | )
Other |  |  | (2,839 | ) |  |  | (168 | ) |  |  | (3,007 | ) |  |  | (2,706 | ) |  |  | — |  |  |  | (2,706 | ) |  |  | (836 | ) |  |  | — |  |  |  | (836 | )
Pre-tax income (loss) from producing activities |  |  | 19,381 |  |  |  | (757 | ) |  |  | 18,624 |  |  |  | 1,302 |  |  |  | (168 | ) |  |  | 1,134 |  |  |  | (28,793 | ) |  |  | (48 | ) |  |  | (28,841 | )
Income tax expense / benefit |  |  | (5,814 | ) |  |  | 227 |  |  |  | (5,587 | ) |  |  | (456 | ) |  |  | 59 |  |  |  | (397 | ) |  |  | 10,434 |  |  |  | 16 |  |  |  | 10,450 |
Results of oil and gas producing activities |  |  | 13,567 |  |  |  | (530 | ) |  |  | 13,037 |  |  |  | 846 |  |  |  | (109 | ) |  |  | 737 |  |  |  | (18,359 | ) |  |  | (32 | ) |  |  | (18,391 | )
Summary of Standardized Measure of Discounted Future Net Cash Flows | The standardized measure does not purport to be an estimate of the fair market value of the Group’s proved reserves. An estimate of fair value would also take into account, among other things, the expected recovery of reserves in excess of proved reserves, anticipated changes in future prices and costs and a discount factor representative of the time value of money and the risks inherent in producing oil and gas.
|  | 2018 |  |  | 2017 |  |  | 2016 |
Consolidated standardized measure of discounted future net cash flows |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |
Future cash inflows (1) |  |  | 1,786,896 |  |  |  | — |  |  |  | 1,786,896 |  |  |  | 564,396 |  |  |  | — |  |  |  | 564,396 |  |  |  | 669,791 |  |  |  | — |  |  |  | 669,791 |
Future production costs |  |  | (913,980 | ) |  |  | — |  |  |  | (913,980 | ) |  |  | (349,819 | ) |  |  | — |  |  |  | (349,819 | ) |  |  | (379,757 | ) |  |  | — |  |  |  | (379,757 | )
Future development costs |  |  | (304,448 | ) |  |  | — |  |  |  | (304,448 | ) |  |  | (128,885 | ) |  |  | — |  |  |  | (128,885 | ) |  |  | (120,862 | ) |  |  | — |  |  |  | (120,862 | )
Future income tax expenses |  |  | (121,388 | ) |  |  | — |  |  |  | (121,388 | ) |  |  | (2,324 | ) |  |  | — |  |  |  | (2,324 | ) |  |  | (29,956 | ) |  |  | — |  |  |  | (29,956 | )
10% annual discount for estimated timing of cash flows |  |  | (138,847 | ) |  |  | — |  |  |  | (138,847 | ) |  |  | (16,935 | ) |  |  | — |  |  |  | (16,935 | ) |  |  | (32,805 | ) |  |  | — |  |  |  | (32,805 | )
Total standardized measure of discounted future net cash flows |  |  | 308,233 |  |  |  | — |  |  |  | 308,233 |  |  |  | 66,433 |  |  |  | — |  |  |  | 66,433 |  |  |  | 106,411 |  |  |  | — |  |  |  | 106,411 |
(1) | For prices used in future cash inflows see “Oil and Gas Reserves”. For the years ended December 31, 2017 and 2016, future cash inflows are stated net of the effect of withholding on exports until 2017 in accordance with Law No. 26,732
Summary of Changes in the Standardized Measure of Discounted Future Net Cash Flows | The following table reflects the changes in standardized measure of discounted future net cash flows for the years ended December 31, 2018, 2017 and 2016:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Beginning of year |  |  | 66,433 |  |  |  | 106,411 |  |  |  | 97,765 |
Sales and transfers, net of production costs |  |  | (62,115 | ) |  |  | (53,759 | ) |  |  | (52,025 | )
Net change in sales and transfer prices, net of future production costs |  |  | 68,651 |  |  |  | (74,046 | ) |  |  | (37,336 | )
Changes in reserves and production rates (timing) |  |  | 111,137 |  |  |  | 15,495 |  |  |  | 4,385 |
Net changes for extensions, discoveries and improved recovery |  |  | 160,784 |  |  |  | 28,489 |  |  |  | 40,565 |
Net change due to purchases and sales of minerals in place |  |  | (730 | ) |  |  | — |  |  |  | 3,234 |
Changes in estimated future development and abandonment costs |  |  | (71,368 | ) |  |  | (32,052 | ) |  |  | (19,356 | )
Development costs incurred during the year that reduced future development costs |  |  | 39,780 |  |  |  | 22,475 |  |  |  | 28,689 |
Accretion of discount |  |  | 11,490 |  |  |  | 9,724 |  |  |  | 10,652 |
Net change in income taxes |  |  | (80,832 | ) |  |  | 25,920 |  |  |  | 8,522 |
Others |  |  | 65,003 |  |  |  | 17,776 |  |  |  | 21,316 |
End of year |  |  | 308,233 |  |  |  | 66,433 |  |  |  | 106,411 |
Oil and Condensate [Member] |
Statement [LineItems] |
Summary of Changes in YPF's Net Proved Reserves | The table below sets forth information regarding changes in YPF’s net proved reserves during 2018, 2017 and 2016, by hydrocarbon product.
|  | 2018 |  |  | 2017 |  |  | 2016 |
Oil and Condensate |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |
|  | (Millions of barrels) |
Consolidated entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  | 422 |  |  |  | 422 |  |  |  | — |  |  |  | 525 |  |  |  | 525 |  |  |  | — |  |  |  | 608 |  |  |  | 607 |  |  |  | 1 |
Developed |  |  | 286 |  |  |  | 286 |  |  |  | — |  |  |  | 380 |  |  |  | 380 |  |  |  | — |  |  |  | 440 |  |  |  | 439 |  |  |  | 1 |
Undeveloped |  |  | 136 |  |  |  | 136 |  |  |  | — |  |  |  | 145 |  |  |  | 145 |  |  |  | — |  |  |  | 168 |  |  |  | 168 |  |  |  | — |
Revisions of previous estimates (1) |  |  | 126 |  |  |  | 126 |  |  |  | — |  |  |  | (71 | ) |  |  | (72 | ) |  |  | — |  |  |  | (75 | ) |  |  | (74 | ) |  |  | (1 | )
Extensions and discoveries |  |  | 103 |  |  |  | 103 |  |  |  | — |  |  |  | 19 |  |  |  | 19 |  |  |  | — |  |  |  | 45 |  |  |  | 45 |  |  |  | — |
Improved recovery |  |  | 15 |  |  |  | 15 |  |  |  | — |  |  |  | 32 |  |  |  | 33 |  |  |  | — |  |  |  | 35 |  |  |  | 35 |  |  |  | — |
Purchase of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | 2 |  |  |  | — |
Sale of minerals in place |  |  | (1 | ) |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (* | ) |  |  | (* | ) |  |  | — |
Production for the year (2) |  |  | (83 | ) |  |  | (83 | ) |  |  | — |  |  |  | (83 | ) |  |  | (83 | ) |  |  | — |  |  |  | (90 | ) |  |  | (90 | ) |  |  | (* | )
At December 31, (3) |  |  | 582 |  |  |  | 582 |  |  |  | — |  |  |  | 422 |  |  |  | 422 |  |  |  | — |  |  |  | 525 |  |  |  | 525 |  |  |  | — |
Developed |  |  | 339 |  |  |  | 339 |  |  |  | — |  |  |  | 286 |  |  |  | 286 |  |  |  | — |  |  |  | 380 |  |  |  | 380 |  |  |  | — |
Undeveloped |  |  | 243 |  |  |  | 243 |  |  |  | — |  |  |  | 136 |  |  |  | 136 |  |  |  | — |  |  |  | 145 |  |  |  | 145 |  |  |  | — |
Equity-accounted entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Developed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Undeveloped |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Revisions of previous estimates (1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Extensions and discoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Improved recovery |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Sale of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Production for the year (2) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
At December 31, (3) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Developed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Undeveloped |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Consolidated and Equity-accounted entities |  |  |  |
At January 1, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed |  |  | 286 |  |  |  | 286 |  |  |  | — |  |  |  | 380 |  |  |  | 380 |  |  |  | — |  |  |  | 440 |  |  |  | 439 |  |  |  | 1 |
Undeveloped |  |  | 136 |  |  |  | 136 |  |  |  | — |  |  |  | 145 |  |  |  | 145 |  |  |  | — |  |  |  | 168 |  |  |  | 168 |  |  |  | — |
Total |  |  | 422 |  |  |  | 422 |  |  |  | — |  |  |  | 525 |  |  |  | 525 |  |  |  | — |  |  |  | 608 |  |  |  | 607 |  |  |  | 1 |
At December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed |  |  | 339 |  |  |  | 339 |  |  |  | — |  |  |  | 286 |  |  |  | 286 |  |  |  | — |  |  |  | 380 |  |  |  | 380 |  |  |  | — |
Undeveloped |  |  | 243 |  |  |  | 243 |  |  |  | — |  |  |  | 136 |  |  |  | 136 |  |  |  | — |  |  |  | 145 |  |  |  | 145 |  |  |  | — |
Total |  |  | 582 |  |  |  | 582 |  |  |  | — |  |  |  | 422 |  |  |  | 422 |  |  |  | — |  |  |  | 525 |  |  |  | 525 |  |  |  | — |
* | Not material (less than 1)
(1) | Revisions in estimates of reserves are performed at least once a year. Revision of oil and gas reserves is considered prospectively in the calculation of depreciation.
(2) | Crude oil production for the years 2018, 2017 and 2016 includes an estimated approximately 12, 12 and 13 mmbbl, respectively, in respect of royalty payments which are a financial obligation, or are substantially equivalent to a production or similar tax.
(3) | Proved crude oil reserves of consolidated entities as of December 31, 2018, 2017 and 2016 include an estimated approximately 83, 61 and 76 mmbbl, respectively, in respect of royalty payments which, as described above, are a financial obligation, or are substantially equivalent to a production or similar tax.
Natural gas [member] |
Statement [LineItems] |
Summary of Changes in YPF's Net Proved Reserves |
| 2018 |  |  | 2017 |  |  | 2016 |
Natural gas |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |
|  | (Billions of standard cubic feet) |
Consolidated entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  | 2,520 |  |  |  | 2,520 |  |  |  | — |  |  |  | 2,923 |  |  |  | 2,923 |  |  |  | — |  |  |  | 3,072 |  |  |  | 3,067 |  |  |  | 5 |
Developed |  |  | 1,850 |  |  |  | 1,850 |  |  |  | — |  |  |  | 2,143 |  |  |  | 2,143 |  |  |  | — |  |  |  | 2,210 |  |  |  | 2,205 |  |  |  | 5 |
Undeveloped |  |  | 670 |  |  |  | 670 |  |  |  | — |  |  |  | 780 |  |  |  | 780 |  |  |  | — |  |  |  | 862 |  |  |  | 862 |  |  |  | — |
Revisions of previous estimates (1) |  |  | 178 |  |  |  | 178 |  |  |  | — |  |  |  | (161 | ) |  |  | (161 | ) |  |  | — |  |  |  | (110 | ) |  |  | (105 | ) |  |  | (5 | )
Extensions and discoveries |  |  | 329 |  |  |  | 329 |  |  |  | — |  |  |  | 313 |  |  |  | 313 |  |  |  | — |  |  |  | 371 |  |  |  | 371 |  |  |  | — |
Improved recovery |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 1 |  |  |  | — |
Purchase of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12 |  |  |  | 12 |  |  |  | — |  |  |  | 165 |  |  |  | 165 |  |  |  | — |
Sale of minerals in place |  |  | (4 | ) |  |  | (4 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (* | ) |  |  | (* | ) |  |  | — |
Production for the year (2) |  |  | (542 | ) |  |  | (542 | ) |  |  | — |  |  |  | (567 | ) |  |  | (567 | ) |  |  | — |  |  |  | (576 | ) |  |  | (576 | ) |  |  | — |
At December 31, (3) (4) |  |  | 2,481 |  |  |  | 2,481 |  |  |  | — |  |  |  | 2,520 |  |  |  | 2,520 |  |  |  | — |  |  |  | 2,923 |  |  |  | 2,923 |  |  |  | — |
Developed |  |  | 1,915 |  |  |  | 1,915 |  |  |  | — |  |  |  | 1,850 |  |  |  | 1,850 |  |  |  | — |  |  |  | 2,143 |  |  |  | 2,143 |  |  |  | — |
Undeveloped |  |  | 566 |  |  |  | 566 |  |  |  | — |  |  |  | 670 |  |  |  | 670 |  |  |  | — |  |  |  | 780 |  |  |  | 780 |  |  |  | — |
Equity-accounted entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Developed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Undeveloped |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Revisions of previous estimates (1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Extensions and discoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Improved recovery |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Sale of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Production for the year (2) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
At December 31, (3) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Developed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Undeveloped |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Consolidated and Equity-accounted entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed |  |  | 1,850 |  |  |  | 1,850 |  |  |  | — |  |  |  | 2,143 |  |  |  | 2,143 |  |  |  | — |  |  |  | 2,210 |  |  |  | 2,205 |  |  |  | 5 |
Undeveloped |  |  | 670 |  |  |  | 670 |  |  |  | — |  |  |  | 780 |  |  |  | 780 |  |  |  | — |  |  |  | 862 |  |  |  | 862 |  |  |  | — |
Total |  |  | 2,520 |  |  |  | 2,520 |  |  |  | — |  |  |  | 2,923 |  |  |  | 2,923 |  |  |  | — |  |  |  | 3,072 |  |  |  | 3,067 |  |  |  | 5 |
At December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed |  |  | 1,915 |  |  |  | 1,915 |  |  |  | — |  |  |  | 1,850 |  |  |  | 1,850 |  |  |  | — |  |  |  | 2,143 |  |  |  | 2,143 |  |  |  | — |
Undeveloped |  |  | 566 |  |  |  | 566 |  |  |  | — |  |  |  | 670 |  |  |  | 670 |  |  |  | — |  |  |  | 780 |  |  |  | 780 |  |  |  | — |
Total |  |  | 2,481 |  |  |  | 2,481 |  |  |  | — |  |  |  | 2,520 |  |  |  | 2,520 |  |  |  | — |  |  |  | 2,923 |  |  |  | 2,923 |  |  |  | — |
* | Not material (less than 1)
(1) | Revisions in estimates of reserves are performed at least once a year. Revision of natural gas reserves is considered prospectively in the calculation of depreciation.
(2) | Natural gas production for the years 2018, 2017 and 2016 includes an estimated approximately 61, 64 and 60 bcf, respectively, in respect of royalty payments which are a financial obligation, or are substantially equivalent to a production or similar tax.
(3) | Proved natural gas reserves of consolidated entities as of December 31, 2018, 2017 and 2016 include an estimated approximately 288, 289 and 337 bcf, respectively, in respect of royalty payments which, as described above, are a financial obligation, or are substantially equivalent to a production or similar tax.
(4) | Proved natural gas reserves of consolidated entities as of December 31, 2018, 2017 and 2016 include an estimated approximately 349, 364 and 467 bcf, respectively, which is consumed as fuel at the field.
Oil equivalent [Member] |
Statement [LineItems] |
Summary of Changes in YPF's Net Proved Reserves |
| 2018 |  |  | 2017 |  |  | 2016 |
Oil equivalent (1) |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |
|  | (Millions of barrels of oil equivalent) |
Consolidated entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  | 929 |  |  |  | 929 |  |  |  | — |  |  |  | 1,113 |  |  |  | 1,113 |  |  |  | — |  |  |  | 1,226 |  |  |  | 1,224 |  |  |  | 2 |
Developed |  |  | 663 |  |  |  | 663 |  |  |  | — |  |  |  | 815 |  |  |  | 815 |  |  |  | — |  |  |  | 889 |  |  |  | 887 |  |  |  | 2 |
Undeveloped |  |  | 266 |  |  |  | 266 |  |  |  | — |  |  |  | 298 |  |  |  | 298 |  |  |  | — |  |  |  | 337 |  |  |  | 337 |  |  |  | — |
Revisions of previous estimates (2) |  |  | 157 |  |  |  | 157 |  |  |  | — |  |  |  | (96 | ) |  |  | (96 | ) |  |  | — |  |  |  | (89 | ) |  |  | (87 | ) |  |  | (2 | )
Extensions and discoveries |  |  | 174 |  |  |  | 174 |  |  |  | — |  |  |  | 80 |  |  |  | 80 |  |  |  | — |  |  |  | 122 |  |  |  | 122 |  |  |  | — |
Improved recovery |  |  | 15 |  |  |  | 15 |  |  |  | — |  |  |  | 32 |  |  |  | 32 |  |  |  | — |  |  |  | 35 |  |  |  | 35 |  |  |  | — |
Purchase of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | 2 |  |  |  | — |  |  |  | 31 |  |  |  | 31 |  |  |  | — |
Sale of minerals in place |  |  | (2 | ) |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | ) |  |  | — |
Production for the year (3) |  |  | (193 | ) |  |  | (193 | ) |  |  | — |  |  |  | (202 | ) |  |  | (202 | ) |  |  | — |  |  |  | (211 | ) |  |  | (211 | ) |  |  | — |
At December 31, (4) |  |  | 1,080 |  |  |  | 1,080 |  |  |  | — |  |  |  | 929 |  |  |  | 929 |  |  |  | — |  |  |  | 1,113 |  |  |  | 1,113 |  |  |  | — |
Developed |  |  | 722 |  |  |  | 722 |  |  |  | — |  |  |  | 663 |  |  |  | 663 |  |  |  | — |  |  |  | 815 |  |  |  | 815 |  |  |  | — |
Undeveloped |  |  | 358 |  |  |  | 358 |  |  |  | — |  |  |  | 266 |  |  |  | 266 |  |  |  | — |  |  |  | 298 |  |  |  | 298 |  |  |  | — |
Equity-accounted entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Developed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Undeveloped |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Revisions of previous estimates (2) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Extensions and discoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Improved recovery |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Sale of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Production for the year (3) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
At December 31, (4) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Developed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Undeveloped |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Consolidated and Equity-accounted entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed |  |  | 663 |  |  |  | 663 |  |  |  | — |  |  |  | 815 |  |  |  | 815 |  |  |  | — |  |  |  | 889 |  |  |  | 887 |  |  |  | 2 |
Undeveloped |  |  | 266 |  |  |  | 266 |  |  |  | — |  |  |  | 298 |  |  |  | 298 |  |  |  | — |  |  |  | 337 |  |  |  | 337 |  |  |  | — |
Total |  |  | 929 |  |  |  | 929 |  |  |  | — |  |  |  | 1,113 |  |  |  | 1,113 |  |  |  | — |  |  |  | 1,226 |  |  |  | 1,224 |  |  |  | 2 |
At December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed |  |  | 722 |  |  |  | 722 |  |  |  | — |  |  |  | 663 |  |  |  | 663 |  |  |  | — |  |  |  | 815 |  |  |  | 815 |  |  |  | — |
Undeveloped |  |  | 358 |  |  |  | 358 |  |  |  | — |  |  |  | 266 |  |  |  | 266 |  |  |  | — |  |  |  | 298 |  |  |  | 298 |  |  |  | — |
Total |  |  | 1,080 |  |  |  | 1,080 |  |  |  | — |  |  |  | 929 |  |  |  | 929 |  |  |  | — |  |  |  | 1,113 |  |  |  | 1,113 |  |  |  | — |
* | Not material (less than 1)
(1) | Volumes of natural gas have been converted to barrels of oil equivalent at 5,615 cubic feet per barrel.
(2) | Revisions in estimates of reserves are performed at least once a year. Revision of crude oil, natural gas liquids and natural gas reserves are considered prospectively in the calculation of depreciation.
(3) | Barrel of oil equivalent production of consolidated entities for the years 2018, 2017 and 2016 includes an estimated approximately 24, 25 and 27 mmboe, respectively, in respect of royalty payments which, as described above, are a financial obligation, or are substantially equivalent to a production or similar tax.
(4) | Proved oil equivalent reserves of consolidated entities as of December 31, 2018, 2017 and 2016 include an estimated approximately 143, 119 and 144 mmboe, respectively, in respect of royalty payments which, as described above, are a financial obligation, or are substantially equivalent to a production or similar tax.
Natural Gas Liquids [Member] |
Statement [LineItems] |
Summary of Changes in YPF's Net Proved Reserves |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Natural Gas Liquids |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |  |  | Worldwide |  |  | Argentina |  |  | Other foreign |
|  | (Millions of barrels) |
Consolidated entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  | 58 |  |  |  | 58 |  |  |  | — |  |  |  | 68 |  |  |  | 68 |  |  |  | — |  |  |  | 71 |  |  |  | 71 |  |  |  | — |
Developed |  |  | 47 |  |  |  | 47 |  |  |  | — |  |  |  | 53 |  |  |  | 53 |  |  |  | — |  |  |  | 56 |  |  |  | 56 |  |  |  | — |
Undeveloped |  |  | 11 |  |  |  | 11 |  |  |  | — |  |  |  | 15 |  |  |  | 15 |  |  |  | — |  |  |  | 15 |  |  |  | 15 |  |  |  | — |
Revisions of previous estimates (1) |  |  | (1 | ) |  |  | (1 | ) |  |  | — |  |  |  | 4 |  |  |  | 4 |  |  |  | — |  |  |  | 5 |  |  |  | 5 |  |  |  | — |
Extensions and discoveries |  |  | 13 |  |  |  | 13 |  |  |  | — |  |  |  | 5 |  |  |  | 5 |  |  |  | — |  |  |  | 11 |  |  |  | 11 |  |  |  | — |
Improved recovery |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Sale of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Production for the year (2) |  |  | (14 | ) |  |  | (14 | ) |  |  | — |  |  |  | (19 | ) |  |  | (19 | ) |  |  | — |  |  |  | (19 | ) |  |  | (19 | ) |  |  | — |
At December 31, (3) |  |  | 56 |  |  |  | 56 |  |  |  | — |  |  |  | 58 |  |  |  | 58 |  |  |  | — |  |  |  | 68 |  |  |  | 68 |  |  |  | — |
Developed |  |  | 41 |  |  |  | 41 |  |  |  | — |  |  |  | 47 |  |  |  | 47 |  |  |  | — |  |  |  | 53 |  |  |  | 53 |  |  |  | — |
Undeveloped |  |  | 15 |  |  |  | 15 |  |  |  | — |  |  |  | 11 |  |  |  | 11 |  |  |  | — |  |  |  | 15 |  |  |  | 15 |  |  |  | — |
Equity-accounted entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Developed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Undeveloped |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Revisions of previous estimates (1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Extensions and discoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Improved recovery |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Purchase of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Sale of minerals in place |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Production for the year (2) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
At December 31, (3) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Developed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Undeveloped |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Consolidated and Equity-accounted entities |  |  |  |
At January 1, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed |  |  | 47 |  |  |  | 47 |  |  |  | — |  |  |  | 53 |  |  |  | 53 |  |  |  | — |  |  |  | 56 |  |  |  | 56 |  |  |  | — |
Undeveloped |  |  | 11 |  |  |  | 11 |  |  |  | — |  |  |  | 15 |  |  |  | 15 |  |  |  | — |  |  |  | 15 |  |  |  | 15 |  |  |  | — |
Total |  |  | 58 |  |  |  | 58 |  |  |  | — |  |  |  | 68 |  |  |  | 68 |  |  |  | — |  |  |  | 71 |  |  |  | 71 |  |  |  | — |
At December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed |  |  | 41 |  |  |  | 41 |  |  |  | — |  |  |  | 47 |  |  |  | 47 |  |  |  | — |  |  |  | 53 |  |  |  | 53 |  |  |  | — |
Undeveloped |  |  | 15 |  |  |  | 15 |  |  |  | — |  |  |  | 11 |  |  |  | 11 |  |  |  | — |  |  |  | 15 |  |  |  | 15 |  |  |  | — |
Total |  |  | 56 |  |  |  | 56 |  |  |  | — |  |  |  | 58 |  |  |  | 58 |  |  |  | — |  |  |  | 68 |  |  |  | 68 |  |  |  | — |
* | Not material (less than 1)
(1) | Revisions in estimates of reserves are performed at least once a year. Revision of oil and gas reserves is considered prospectively in the calculation of depreciation.
(2) | Natural gas liquids production for the years 2018, 2017 and 2016 includes an estimated approximately 2, 2 and 2 mmbbl, respectively, in respect of royalty payments which are a financial obligation, or are substantially equivalent to a production or similar tax.
(3) | Proved natural gas liquids reserves of consolidated entities as of December 31, 2018, 2017 and 2016 include an estimated approximately 8, 6 and 8 mmbbl, respectively, in respect of royalty payments which, as described above, are a financial obligation, or are substantially equivalent to a production or similar tax.

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