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Goodwill and Other Intangible Assets (Intangible Assets Acquired) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 454 | $ 121
Computer Software, Intangible Asset [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 35 | $ 61
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years | 5 years
Other Intangible Assets [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Other intangible assets acquired | $ 22 | $ 5
Contracts |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 28 | $ 2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 20 years | 35 years
Project Development Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 109 | $ 8
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 30 years | 29 years
Emission allowances [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 56 | $ 22
Transmission Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 23
Compensation from Concession Agreement |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |
Transmission Rights [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired | $ 20 |
Compensation from Concession Agreement |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired | $ 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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