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v3.19.1

Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 MMBbls Bcf Rate MMBoe | Dec. 31, 2017 MMBbls Bcf MMBoe | Dec. 31, 2016 MMBbls Bcf MMBoe MBbls
Disclosure of discounted future net cash flow [line items] |  |  |
Extension and discoveries of proved development reserves | 25 | 26 | 42
Extension and discoveries of proved undevelopment reserves | 149 | 54 | 79
Net proved reserves of oil equivalent, Improved recovery | 15 | 32 | 35
Proved developed reserves of sales and acquisition | 1.4 |  | 19.5
Revised proved reserves | 156 | 96 | 89
Proved developed reserves added due to higher average oil price | 143 |  |
Proved undeveloped reserves revisions of previous estimates of economic conditions increases-decreases | 48 | 20 | 45
Proved developed reserves revisions of previous estimates increases by liquids and gas production performance | 33 | 25 | 68
Proved reserves revisions of previous estimates of change of development strategy | 43 |  |
Proved reserves revisions of previous estimates of Production and forecast Decreases | 13 | 7 | 10
Net proved reserves of sales and acquisition |  | 2.3 | 30.7
Proved developed reserves reduced due to lower average oil price |  | 105 | 105
Proved developed reserves revisions of previous estimates increases by well performance |  | 48 | 80
Proved reserves revisions of previous estimates of feasibility studies increases |  | 5.6 | 12
Proved undeveloped reserves of sales and acquisition |  |  | 11.2
Percentage of discount rate | 10.00% |  |
Selling exchange rate | Rate | 37.60 |  |
Golfo San Jorge basin [Member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Proved developed reserves of oil equivalent, Improved reserves | 4.4 | 5.6 | 8
Proved undeveloped reserves of oil equivalent, Improved reserves | 8 | 9.6 | 17
Proved developed reserves added due to higher average oil price | 40 |  |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases | 33 | 3 | 16
Proved developed reserves reduced due to lower average oil price |  | (25) | (40)
Proved developed reserves revisions of previous estimates increases by well performance |  | 14 | 42
Proved reserves revisions of previous estimates of feasibility studies increases |  | 3.5 | 2
Neuquina basin [Member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Proved developed reserves of oil equivalent, Improved reserves | 3 | 5.4 | 7
Proved undeveloped reserves of oil equivalent, Improved reserves | 3 | 10 | 2
Proved developed reserves added due to higher average oil price | 56 |  |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases | 15 | 15 | 15
Reduction of proved undeveloped reserves due to changes in gas compression projects | 5 |  |
Proved developed reserves reduced due to lower average oil price |  | (60) | (43)
Proved developed reserves revisions of previous estimates increases by well performance |  | 31 | 27
Proved developed reserves revisions of previous estimates decreases by well performance |  | 23 | 12
Proved reserves revisions of previous estimates of feasibility studies increases |  | 2.1 | 10
Austral, Golfo San Jorge and Cuyana basins [member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Proved undeveloped reserves reduction | 5 |  |
Golfo San Jorge And Neuquina Basins [member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Proved reserves revisions of previous estimates of WO jobs performance increases |  | 4.2 |
Crude oil [Member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Extension and discoveries of proved development reserves | MMBbls | 8 | 7.4 | 15.5
Extension and discoveries of proved undevelopment reserves | MMBbls | 95 | 11.7 | 29
Revised proved reserves | 126 | 71 | 75
Natural Gas Liquids [Member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Extension and discoveries of proved development reserves | MMBbls | 1 | 1.9 | 3.8
Extension and discoveries of proved undevelopment reserves | MMBbls | 12 | 3.4 | 7
Revised proved reserves | 1 | 4 | 5
Natural gas [member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Extension and discoveries of proved development reserves | Bcf | 92 | 94 | 128.8
Extension and discoveries of proved undevelopment reserves | Bcf | 238 | 219 | 242
Revised proved reserves | Bcf | 178 | 161 | 110
Austral basin [Member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Proved developed reserves added due to higher average oil price | 31 |  |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases |  |  | 12
Proved developed reserves reduced due to lower average oil price |  |  | (14)
Cuyana basin [Member] |  |  |
Disclosure of discounted future net cash flow [line items] |  |  |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases |  |  | 2
Proved developed reserves reduced due to lower average oil price |  | (14) | (8)

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