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Property, Plant and Equipment - Narrative (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Capitalized software costs | $ 2,500 | $ 2,100 |
Capitalized software, accumulated amortization | 1,100 | 900 |
Capitalized software, amortization expense | 416 | $ 358 | $ 344
Capitalized software, estimated amortization year 1 | 428 |  |
Capitalized software, estimated amortization year 2 | 371 |  |
Capitalized software, estimated amortization year 3 | 288 |  |
Capitalized software, estimated amortization year 4 | 186 |  |
Capitalized software, estimated amortization year 5 | $ 72 |  |
Software and Software Development Costs | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Software and Software Development Costs | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 7 years |  |

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