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Income And Other Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income and Other Taxes [Line Items] |  |  |  |
Net deferred income tax expense (credits)/changes for tax rate and law changes |  | $ (28) | $ 24 | $ 30
Effective income tax rate reconciliation, European tax on energy sector, amount | $ 1,800 |  | $ 200 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 21.00% | 21.00%
Valuation Allowance [Abstract] |  |  |  |
Asset valuation allowances |  | $ 2,516 | $ 2,641 |
Valuation allowance change |  | $ (125) |  |
Potential percentage increase in unrecognized tax benefits |  | 20.00% |  |
Potential percentage decrease in unrecognized tax benefits |  | 30.00% |  |
Interest expense on income tax reserves |  | $ 142 | 60 | $ 16
Interest payable on income tax reserves |  | 275 | $ 134 |
Change in net provisions [Member] |  |  |  |
Valuation Allowance [Abstract] |  |  |  |
Valuation allowance change |  | 41 |  |
Effects of foreign currency translation [Member] |  |  |  |
Valuation Allowance [Abstract] |  |  |  |
Valuation allowance change |  | $ (166) |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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