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Investments - Schedule of Amortized Cost and Fair Value of the Trust Investments (Details) - SCE - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Measurements |  |
Fair Values | $ 4,475 | $ 4,286
Deferred tax liabilities on net unrealized gains | 436 | 373
Total debt securities and other |  |
Fair Value Measurements |  |
Amortized Costs | 2,394 | 2,428
Fair Values | 2,641 | 2,655
Municipal bonds |  |
Fair Value Measurements |  |
Amortized Costs | 738 | 729
Fair Values | 911 | 860
Government and agency securities |  |
Fair Value Measurements |  |
Amortized Costs | 1,193 | 1,201
Fair Values | 1,401 | 1,341
Corporate bonds |  |
Fair Value Measurements |  |
Amortized Costs | 320 | 346
Fair Values | 381 | 392
Short-term investments and receivables/(payables) |  |
Fair Value Measurements |  |
Amortized Costs | 143 | 152
Fair Values | (52) | 62
Repurchase Agreements |  |
Fair Value Measurements |  |
Fair Values | 11 | 18
Equity securities |  |
Fair Value Measurements |  |
Fair Values | $ 1,834 | $ 1,631

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