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Early Plant Retirements Early Plant Retirements (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2022 | Oct. 31, 2021 | Mar. 31, 2022 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
ZEC Charge per kwh |  |  |  |  | $ 0.004 |  |
ZEC Charge per MWh |  |  |  |  | 10 |  |
Gain (Loss) on Asset Disposition |  |  |  | $ (400,000,000) | 122,000,000 |  |
Assets Held-for-sale, Not Part of Disposal Group |  |  |  |  | 2,060,000,000 |  |
Liabilities Held for Sale |  |  |  |  | 144,000,000 | $ 0 |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  | 2,691,000,000 |  |
Loss on Extinguishment of Debt |  | $ 298,000,000 |  |  | (298,000,000) | $ 0 | $ 0
Severance Costs |  |  |  |  | 13,000,000 |  |
Current Assets [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group |  |  |  |  | 264,000,000 |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group |  |  |  |  | 1,742,000,000 |  |
Noncurrent Assets [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group |  |  |  |  | 54,000,000 |  |
Current Liabilities [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Liabilities Held for Sale |  |  |  |  | 57,000,000 |  |
Noncurrent Liabilities [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Liabilities Held for Sale |  |  |  |  | 87,000,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  | $ 1,920,000,000 |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | $ 20,000,000 |  |  |  |  |  |
Other Production-Solar [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Asset Disposition |  |  |  |  | 63,000,000 |  |
Deferred ITC previously recognized |  |  |  |  | 185,000,000 |  |
Disposal group, gain (loss) on sale tax impact |  |  |  |  | $ 62,000,000 |  |

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