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Asset Impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Asset Impairments |  |  |  |  |  |  |  |
Impairment losses on investments |  |  |  |  |  | $ 102 | $ 0 | $ 0
Impairment losses |  |  |  |  |  | $ 26 | 206 | $ 544
Goodwill impairment losses |  |  | $ 130 |  |  |  | 130 |
Gladstone |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |
Impairment losses on investments | $ 102 |  |  |  |  |  |  |
East |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |
Impairment losses | 4 | $ 43 | $ 20 | $ 16 |  |  | 13 |
Goodwill impairment losses |  |  |  |  |  |  | 130 |
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 | 20 |  |  | $ 9 |  |  |  |
Texas |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |
Impairment losses | $ 2 |  |  |  |  |  |  |
Goodwill impairment losses |  |  |  |  |  |  | $ 0 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-4 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481664/323-10-45-1 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482548/350-20-55-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482598/350-20-45-2 + Details
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