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Supplemental Information on Oil and Gas Operations (Unaudited) (Narrative) (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) MMBoe $ / bbl $ / Mcf | Dec. 31, 2019 USD ($) MMBoe | Dec. 31, 2018 USD ($) MMBoe | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2017 USD ($) MMBoe
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves | [1] | 752 | 757 | 823 |  |  |  | 787
Standardized measure of discounted future net cash flows | $ |  | $ 3,472 | $ 5,398 | $ 7,150 |  |  |  | $ 5,954
Proved developed and undeveloped reserves, revisions due to prices | [1] | (78) | (28) | 15 |  |  |  |
Proved developed and undeveloped reserves, revisions other than price (MMBoe) |  | 55 | 75 |  |  |  |  |
Proved developed and undeveloped reserves, additional downward revisions other than price(MMBoe) |  | 20 | 5 |  |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries | [1] | 135 | 160 | 206 |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries related to additions from infill drilling activities (MMBoe) |  |  |  | 21 |  |  |  |
Proved undeveloped reserves increased percentage |  | 6.00% |  |  |  |  |  |
Proved undeveloped reserves as percentage of entire proved reserves |  | 24.00% |  |  |  |  |  |
Proved undeveloped reserves | [1] | 178 | 168 | 223 |  |  |  | 202
Proved undeveloped reserves due to drilling and development activities (MMBoe) |  | 105 |  |  |  |  |  |
Proved undeveloped reserves, conversion to proved developed reserves (MMBoe) |  | 68 |  |  |  |  |  |
Proved undeveloped reserves to proved developed reserves conversion percentage |  | 40.00% |  |  |  |  |  |
Cost incurred related to development and conversion of proved undeveloped reserves | $ |  | $ 448 |  |  |  |  |  |
Average estimated future realized price per barrel of oil used to estimate future cash inflows for proved oil reserves | $ / bbl |  | 37.35 |  |  |  |  |  |
Average estimated future realized price per Mcf of gas used to estimate future cash inflows for proved gas reserves | $ / Mcf |  | 1.37 |  |  |  |  |  |
Average estimated future realized price per barrel of natural gas liquids used to estimate future cash inflows for proved NGL reserves | $ / bbl |  | 10.76 |  |  |  |  |  |
Future development costs | $ |  | $ 1,747 | $ 2,093 | $ 2,957 |  |  |  |
Future dismantlement, abandonment and rehabilitation costs | $ |  | $ 300 |  |  |  |  |  |
Scenario Forecast [Member] |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Future development costs | $ |  |  |  |  | $ 200 | $ 400 | $ 600 |
Delaware Basin [Member] |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, revisions other than price (MMBoe) |  | 40 | 6 |  |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries |  | 117 | 77 | 88 |  |  |  |
Percentage of extensions and discoveries proved undeveloped reserves |  | 87.00% |  |  |  |  |  |
Proved undeveloped reserves revisions other than price |  | 8 |  |  |  |  |  |
STACK [Member] |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, revisions other than price (MMBoe) |  | 22 | 9 |  |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries |  | 8 | 37 | 87 |  |  |  |
Eagle Ford [Member] |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries |  | 5 | 18 |  |  |  |  |
Powder River Basin [Member] |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, extensions and discoveries |  | 5 | 28 |  |  |  |  |
STACK and Delaware Basin [Member] |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Percentage of additions to proved developed and undeveloped reserves for extensions and discoveries |  |  |  | 85.00% |  |  |  |
Anadarko Basin |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Proved undeveloped reserves revisions other than price |  | 12 |  |  |  |  |  |
Barnett Shale Discontinued Operations [Member] |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves |  |  | 612 |  |  |  |  |
Standardized measure of discounted future net cash flows | $ |  |  | $ 940 |  |  |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves |  |  |  | 1,104 |  |  |  |
Standardized measure of discounted future net cash flows | $ |  |  |  | $ 3,042 |  |  |  |
[1] | Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. NGL reserves are converted to Boe on a one-to-one basis with oil. The conversion rates are not necessarily indicative of the relationship of oil, natural gas and NGL prices.

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