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Severance (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) employee | Dec. 31, 2023 USD ($) employee | Dec. 31, 2022 USD ($) employee
Restructuring and Related Activities [Abstract] |  |  |
Number of eligible employees | employee | 341 | 682 | 233
Severance expense | $ | $ (28) | $ 102 | $ 65
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] | Operation, maintenance and other |  |

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- Definition Indicates line item in statement of income or comprehensive income that includes restructuring charges. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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