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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
Income Tax [Line Items] |  |  |  |
Federal valuation allowance amount removed | $ 826 | $ 814 |  |
Valuation allowance against deferred tax assets, percent | 50.00% |  |  |
Net operating loss carryforwards, deferred tax assets | $ 447 | 526 |  |
Net operating loss carryforwards | 22 |  |  |
Capital loss carryforwards | 542 | 523 |  |
Unrecognized tax benefits, interest expense (benefit) | 4 |  |  |
Unrecognized tax benefit that would impact effective tax rate | 83 | 73 |  |
Deferred unrecognized tax benefits |  |  | $ 42 |
Current unrecognized tax benefits |  | $ 42 |  |
United States Federal [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Federal valuation allowance amount removed | 264 |  |  |
Net operating loss carryforwards | 139 |  |  |
United States Federal [Member] | Expires between 2030 and 2037 [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards | 117 |  |  |
Various U.S. States [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards | 303 |  |  |
Canada [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards | 5 |  |  |
Capital loss carryforwards | $ 557 |  |  |
WPX Merger [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Deferred income taxes |  |  |  | $ 250
WPX Merger [Member] | United States Federal [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Federal valuation allowance amount removed |  |  | $ 84 |

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