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Investments - Amortized Cost and Fair Value of Trust Investments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Fair Values | $ 4,286 | $ 4,173
SCE |  |
Fair Value |  |
Fair Values | 4,286 | 4,173
Deferred income taxes related to unrealized gains | 373 | 380
SCE | Total debt securities and other |  |
Fair Value |  |
Amortized Costs | 2,428 | 2,233
Fair Values | 2,655 | 2,515
SCE | Municipal bonds |  |
Fair Value |  |
Amortized Costs | 729 | 636
Fair Values | 860 | 757
SCE | Government and agency securities |  |
Fair Value |  |
Amortized Costs | 1,201 | 1,072
Fair Values | 1,341 | 1,186
SCE | Corporate bonds |  |
Fair Value |  |
Amortized Costs | 346 | 361
Fair Values | 392 | 401
SCE | Short-term investments and receivables/payables |  |
Fair Value |  |
Amortized Costs | 152 | 164
Fair Values | 62 | 171
SCE | Repurchase Agreements |  |
Fair Value |  |
Fair Values | 18 | 38
SCE | Equity securities |  |
Fair Value |  |
Fair Values | $ 1,631 | $ 1,658

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