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Goodwill and Other Intangible Assets (Intangible Assets Acquired) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 448 | $ 822
Computer Software, Intangible Asset [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 136 | $ 89
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years | 6 years
Other Intangible Assets [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Other intangible assets acquired | $ 1 | $ 2
Contract-Based Intangible Assets [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 196 | $ 35
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 23 years | 12 years
Project Development Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 67 | $ 667
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years | 35 years
Emission allowances [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 35 | $ 22
Transmission Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 0
Compensation from Concession Agreement |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 12 years
Use Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | 13 |
Transmission Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired | $ 0 |
Compensation from Concession Agreement |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired |  | $ 7

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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://fasb.org/us-gaap/role/ref/legacyRef -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 + 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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