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Investments - Amortized Cost and Fair Value of Trust Investments (Details) - SCE - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Measurements |  |
Fair Values | $ 4,231 | $ 4,286
Deferred income taxes related to unrealized gains | 361 | 373
Total debt securities and other |  |
Fair Value Measurements |  |
Amortized Costs | 2,420 | 2,428
Fair Values | 2,656 | 2,655
Municipal bonds |  |
Fair Value Measurements |  |
Amortized Costs | 759 | 729
Fair Values | 897 | 860
Government and agency securities |  |
Fair Value Measurements |  |
Amortized Costs | 1,212 | 1,201
Fair Values | 1,384 | 1,341
Corporate bonds |  |
Fair Value Measurements |  |
Amortized Costs | 332 | 346
Fair Values | 383 | 392
Short-term investments and receivables/payables |  |
Fair Value Measurements |  |
Amortized Costs | 117 | 152
Fair Values | (8) | 62
Repurchase Agreements |  |
Fair Value Measurements |  |
Fair Values | 9 | 18
Equity securities |  |
Fair Value Measurements |  |
Fair Values | $ 1,575 | $ 1,631

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