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Goodwill and Other Intangible Assets (Intangible Assets Acquired) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 266 | $ 536
Computer Software, Intangible Asset [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 114 | $ 159
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 11 years | 15 years
Other Intangible Assets [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Other intangible assets acquired | $ 8 | $ 9
Contracts |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 12
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 21 years
Project Development Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 134 | $ 242
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 40 years | 39 years
Emission allowances [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 8 | $ 23
Transmission Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 91
Use Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 2 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 + Details
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