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Early Plant Retirements/Asset Dispositions Early Plant Retirements/Asset Dispositions (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2021
Early Plant Retirements [Abstract] |  |  |
ZEC Charge per kwh | $ 0.004 |  |
Proceeds from Divestiture of Businesses |  | $ 1,920,000,000 |
Impairment of Long-Lived Assets to be Disposed of |  | 43,000,000 | $ 2,691,000,000
ZEC Charge per MWh | 10 |  |
Early Plant Retirements/Asset Dispositions [Line Items] |  |  |
Impairment of Long-Lived Assets to be Disposed of |  | 43,000,000 | $ 2,691,000,000
Proceeds from Divestiture of Businesses |  | $ 1,920,000,000 |
ZEC Charge per MWh | 10 |  |
Expected Nuclear Production tax Credit per MWh | $ 15 |  |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2611-110228 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585 + Details
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