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Intangibles (Schedule of Intangibles) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |  |  |
Retirement of Intangibles |  | $ (76) | $ (172) |
Purchases of Intangible Assets |  | 70 | 98 |
Sales and Transfers of Intangible Assets | [1] |  | (63) |
Impairments |  |  | (1) |
Intangible Assets |  | 14 | 20 | $ 158
Renewable Energy Credits [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Retirement of Intangibles |  | (76) | (114) |
Purchases of Intangible Assets |  | 70 | 89 |
Sales and Transfers of Intangible Assets | [1] |  | (1) |
Impairments |  |  | 0 |
Intangible Assets |  | 14 | 20 | 46
Emissions Allowances [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Retirement of Intangibles |  | 0 | (58) |
Purchases of Intangible Assets |  | 0 | 9 |
Sales and Transfers of Intangible Assets | [1] |  | (62) |
Impairments |  |  | (1) |
Intangible Assets |  | $ 0 | 0 | $ 112
Transfer to Assets Held for Sale |  |  | $ 52 |
[1] | Includes $52 million classified as Assets Held for Sale. See Note 4. Early Plant Retirements/Asset Dispositions and Impairments.

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- Definition Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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