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Asset Impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2019
Asset Impairments |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | $ 206 | $ 544 | $ 75 |
Goodwill impairment losses |  | $ 130 |  |  |  |  | 130 | 35 |  |
Petra Nova Parish Holdings |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |
Impairment losses on equity method investments |  |  |  |  |  | $ 18 |  |  |  |
Letter of credit |  |  |  |  |  |  |  |  |  | $ 12
East |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |
Impairment losses | $ 43 | $ 20 | $ 16 |  |  |  | 13 |  |  |
Goodwill impairment losses |  |  |  |  |  |  | 130 | 35 |  |
East | Joliet facility |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  | 213 |  |  |  |  |  |  |
East | PJM Coal Generating Assets |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | $ 271 |  |  |  |  |  |
Goodwill impairment losses |  |  |  | $ 35 |  |  |  |  |  |
West/Services/Other |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  | $ 9 |  |  |  |  |  |  |
West/Services/Other | Held-for-sale | Home Solar |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |
Impairment loss to adjust the carrying amount of assets and liabilities |  |  |  |  | $ 29 |  |  |  |  |
West/Services/Other | Cottonwood |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |
Impairment losses on equity method investments |  |  |  |  |  |  |  |  | 32 |
Texas |  |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |  |
Goodwill impairment losses |  |  |  |  |  |  | $ 0 | $ 0 |  |
Impairment losses, other assets |  |  |  |  |  |  |  |  | $ 14 |

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