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Income Taxes - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) MW | Dec. 31, 2024 USD ($) MW | Dec. 31, 2023 USD ($) MW | Dec. 31, 2022 USD ($)
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax expense |  | $ 9 | $ 108 | $ (177)
Investment tax credit | $ 231 |  |  |
Unrecognized tax benefits that would impact the effective tax rate |  | 72 |  |
SCE |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax expense |  | 69 | $ 179 | $ (111)
Unrecognized tax benefits that would impact the effective tax rate |  | $ 66 |  |
SCE | SCE Power Purchases Contracts |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Power generating capacity of projects owned controlled | MW | 200 | 5,200 | 3,343 |
SCE | SCE Power Purchases Contracts |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Power generating capacity of projects owned controlled | MW | 112.5 |  |  |
Capistrano Wind |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax expense |  | $ 107 | $ 106 |

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + 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/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -SubTopic 10 -Topic 740 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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