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Asset Impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | $ 35 |  |
Impairment losses, other assets |  |  |  |  |  |  |  |  | $ 12
Petra Nova Parish Holdings |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment losses on equity method investments |  |  |  |  | $ 18 | $ 101 |  |  |
Letter of credit |  |  |  |  |  | 12 |  |  |
Contribution in cash |  |  |  |  |  | 95 |  |  |
Guarantee (up to) |  |  |  |  |  | $ 124 |  |  |
East |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment | $ 16 |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | 35 |  |
East | Joliet facility |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment | 213 |  |  |  |  |  |  |  |
East | PJM Coal Generating Assets |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment |  | $ 271 |  |  |  |  |  |  |
Impairment losses |  | $ 35 |  |  |  |  |  |  |
West/Services/Other |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment | $ 9 |  |  |  |  |  |  |  |
West/Services/Other | Held-for-sale | Home Solar |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment loss to adjust the carrying amount of assets and liabilities |  |  | $ 29 | $ 29 |  |  |  |  |
West/Services/Other | Cottonwood |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment losses on equity method investments |  |  |  |  |  |  | 32 |  |
Texas |  |  |  |  |  |  |  |  |
Asset Impairments |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | $ 0 |  |
Impairment losses, other assets |  |  |  |  |  |  |  | $ 14 |

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- Definition Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: 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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=124268079&loc=d3e32787-111569 + Details
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