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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Income Tax [Line Items] |  |
Federal valuation allowance amount removed | $ 794 | $ 826
Valuation allowance against deferred tax assets, percent | 50.00% |
Net operating loss carryforwards, deferred tax assets | $ 428 | 447
Capital loss carryforwards | 497 | 542
Unrecognized tax benefits, interest expense (benefit) | 12 | 4
Unrecognized tax benefit that would impact effective tax rate | 105 | $ 83
United States Federal [Member] |  |
Income Tax [Line Items] |  |
Federal valuation allowance amount removed | 281 |
Net operating loss carryforwards | 107 |
United States Federal [Member] | Expires between 2035 and 2036 [Member] |  |
Income Tax [Line Items] |  |
Net operating loss carryforwards | 60 |
United States Federal [Member] | No Expire [Member] |  |
Income Tax [Line Items] |  |
Net operating loss carryforwards | 47 |
Various U.S. States [Member] |  |
Income Tax [Line Items] |  |
Net operating loss carryforwards | 313 |
Various U.S. States [Member] | Expires between 2025 and 2040 [Member] |  |
Income Tax [Line Items] |  |
Net operating loss carryforwards | 149 |
Various U.S. States [Member] | No Expire [Member] |  |
Income Tax [Line Items] |  |
Net operating loss carryforwards | 164 |
Canada [Member] |  |
Income Tax [Line Items] |  |
Net operating loss carryforwards | 8 |
Capital loss carryforwards | 505 |
WPX Merger [Member] |  |
Income Tax [Line Items] |  |
Capital loss carryforwards | $ 489 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount of interest expense for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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