Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Disclosure of Proved Developed and Undeveloped Reserve (Detail) - Bcf Bcf in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Crude Oil and Condensate Reserves | |||
| Proved developed and undeveloped reserves: | |||
| Beginning balance | 5,494,000 | 5,894,000 | 6,089,000 |
| Revisions | 498,000 | 271,000 | 529,000 |
| Extensions and discoveries | 10,000 | 26,000 | 16,000 |
| Production | (650,000) | (705,000) | (744,000) |
| Farm outs & transfer to exploration and production contracts (CEE) & transfer of fields due to NHC bidding process | 0 | 8,000 | 4,000 |
| Ending Balance | 5,352,000 | 5,494,000 | 5,894,000 |
| Proved developed reserves at December 31, | 3,162,000 | 3,464,000 | 3,500,000 |
| Proved undeveloped reserves at December 31, | 2,190,000 | 2,031,000 | 2,394,000 |
| Dry gas reserve | |||
| Proved developed and undeveloped reserves: | |||
| Beginning balance | 10,175,000,000 | 8,251,000,000 | 7,080,000,000 |
| Revisions | 1,738,000,000 | 2,752,000,000 | 2,069,000,000 |
| Extensions and discoveries | 14,000,000 | 56,000,000 | 12,000,000 |
| Production | (901,000,000) | (888,000,000) | (917,000,000) |
| Farm outs & transfer to exploration and production contracts (CEE) & transfer of fields due to NHC bidding process | 0 | 4,000,000 | 7,000,000 |
| Ending Balance | 11,026,000,000 | 10,175,000,000 | 8,251,000,000 |
| Proved developed reserves at December 31, | 7,054,000,000 | 5,773,000,000 | 4,314,000,000 |
| Proved undeveloped reserves at December 31, | 3,972,000,000 | 4,400,000,000 | 3,936,000,000 |