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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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- Definition

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-Topic 820
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