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Goodwill and Other Intangible Assets (Intangible Assets Acquired) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 822 | $ 454
Computer Software, Intangible Asset [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 89 | $ 35
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years | 4 years
Other Intangible Assets [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Other intangible assets acquired | $ 2 | $ 22
Contracts |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 35 | $ 28
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years | 20 years
Project Development Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 667 | $ 109
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 35 years | 30 years
Emission allowances [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 22 | $ 56
Transmission Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 20
Compensation from Concession Agreement |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years | 12 years
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 | $ 184

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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