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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Aug. 16, 2022 | Mar. 31, 2021 | Jan. 07, 2021
Income Tax [Line Items] |  |  |  |  |  |
Corporate alternative minimum tax |  |  |  | 15.00% |  |
Deferred income taxes |  |  |  |  |  | $ 249
Federal valuation allowance amount removed | $ 814 | $ 893 |  |  |  |
Income tax expense (benefit) | 1,738 | 65 | $ (547) |  |  |
Current income tax expense (benefit) | 559 | 16 | (219) |  |  |
Deferred income tax expense (benefit) | 1,179 | 49 | $ (328) |  |  |
Valuation allowance against deferred tax assets, percent |  |  | 100.00% |  |  |
Unrecognized tax benefits increased | 51 |  |  |  |  |
Net operating loss carryforwards, deferred tax assets | 526 | 1,075 |  |  |  |
Net operating loss carryforwards | 22 |  |  |  |  |
Unrecognized tax benefits, interest expense (benefit) | 0 |  |  |  |  |
Unrecognized tax benefit that would impact effective tax rate | 73 | 36 |  |  |  |
Unrecognized tax benefits, decrease resulting from current period tax positions | 42 | 5 |  |  |  |
Deferred unrecognized tax benefits |  | 42 |  |  |  |
Severance and other non-income tax refunds | 5 | 39 | $ 40 |  |  |
CARES Act [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  |  | (113) |  |  |
Current income tax expense (benefit) |  |  | (220) |  |  |
Deferred income tax expense (benefit) |  |  | $ 107 |  |  |
United States Federal [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Federal valuation allowance amount removed | 268 |  |  |  |  |
Net operating loss carryforwards | 221 |  |  |  |  |
United States Federal [Member] | Expires between 2030 and 2037 [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Net operating loss carryforwards | 199 |  |  |  |  |
Various U.S. States [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Net operating loss carryforwards | 305 |  |  |  |  |
WPX Merger [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Deferred income taxes | $ 1 |  |  |  | $ 250 |
WPX Merger [Member] | United States Federal [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Federal valuation allowance amount removed |  | $ 84 |  |  |  |

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