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Supplemental Information on Oil and Gas Operations (Unaudited) (Narrative) (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) MMBoe $ / bbl $ / Mcf | Dec. 31, 2023 USD ($) MMBoe | Dec. 31, 2022 USD ($) MMBoe | Dec. 31, 2027 USD ($) | Dec. 31, 2026 USD ($) | Dec. 31, 2025 USD ($)
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved developed and undeveloped reserves, revisions due to prices | 54 | 78 | (34) |  |  |
Proved developed and undeveloped reserves, revisions other than price (MMBoe) | 75 | (1) | (49) |  |  |
Proved developed reserve net energy period increase decrease | 81 | 11 |  |  |  |
Proved developed and undeveloped reserves, additional downward revisions other than price(MMBoe) | (6) | (12) |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 340 | 322 | 278 |  |  |
Proved developed and undeveloped reserves revisions due to change in previously adopted development plans | (8) |  |  |  |  |
Proved developed and undeveloped reserves, Purchase of reserves | 247 |  | 153 |  |  |
Proved undeveloped reserves increased percentage | 12.00% |  |  |  |  |
Proved undeveloped reserves as percentage of entire proved reserves | 20.00% |  |  |  |  |
Proved undeveloped reserves due to drilling and development activities (MMBoe) | 198 |  |  |  |  |
Conversion to proved developed reserves | 189 |  |  |  |  |
Cost incurred related to development and conversion of proved undeveloped reserves | $ | $ 1,200 |  |  |  |  |
Proved Undeveloped Reserves Revisions with Additional Revisions | (2) |  |  |  |  |
Average estimated future realized price per barrel of oil used to estimate future cash inflows for proved oil reserves | $ / bbl | 73.65 |  |  |  |  |
Average estimated future realized price per Mcf of gas used to estimate future cash inflows for proved gas reserves | $ / Mcf | 0.81 |  |  |  |  |
Average estimated future realized price per barrel of natural gas liquids used to estimate future cash inflows for proved NGL reserves | $ / bbl | 20.75 |  |  |  |  |
Future development costs | $ | $ 6,099 | $ 5,241 | $ 5,176 |  |  |
Future dismantlement, abandonment and rehabilitation costs | $ | $ 1,300 |  |  |  |  |
Scenario Forecast [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Future development costs | $ |  |  |  | $ 500 | $ 1,400 | $ 2,200
Delaware Basin |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved developed and undeveloped reserves, revisions other than price (MMBoe) | 55 | 7 | (33) |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 252 | 212 | 255 |  |  |
Proved undeveloped reserves percentage | 68.00% |  |  |  |  |
Percentage of extensions and discoveries proved undeveloped reserves | 75.00% |  |  |  |  |
Proved undeveloped reserves revisions other than price | (6) |  |  |  |  |
Williston Basin |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved developed and undeveloped reserves, additional downward revisions other than price(MMBoe) |  | (19) |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 36 | 19 | 5 |  |  |
Proved developed and undeveloped reserves, Purchase of reserves | 247 |  | 66 |  |  |
Percentage of extensions and discoveries proved undeveloped reserves | 17.00% |  |  |  |  |
Proved undeveloped reserves revisions other than price | (2) |  |  |  |  |
Eagle Ford [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved developed and undeveloped reserves, revisions other than price (MMBoe) |  | 5 |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 16 | 32 | 6 |  |  |
Proved developed and undeveloped reserves, Purchase of reserves |  |  | 87 |  |  |
Percentage of extensions and discoveries proved undeveloped reserves | 2.00% |  |  |  |  |
Powder River Basin [Member] |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved developed and undeveloped reserves, revisions other than price (MMBoe) | 6 | 2 | (5) |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 6 | 26 | 7 |  |  |
Percentage of extensions and discoveries proved undeveloped reserves | 3.00% |  |  |  |  |
Anadarko Basin |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |
Proved developed and undeveloped reserves, revisions other than price (MMBoe) | 7 | 4 | (4) |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | 30 | 33 | 5 |  |  |
Proved undeveloped reserves percentage | 17.00% |  |  |  |  |
Percentage of extensions and discoveries proved undeveloped reserves | 3.00% |  |  |  |  |

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