Regulatory Assets and Liabilities - Regulatory Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Regulatory Assets
Total current	$ 2,748	$ 2,524
Total long-term	8,886	8,897
SCE
Regulatory Assets
Total current	2,748	2,524
Total long-term	8,886	8,897
Total regulatory assets	11,634	11,421
SCE | Regulatory balancing and memorandum accounts
Regulatory Assets
Total current	2,723	2,502
Total long-term	867	1,257
SCE | Other
Regulatory Assets
Total current	25	22
Total long-term	100	114
SCE | Deferred income taxes
Regulatory Assets
Total long-term	5,982	5,533
SCE | Unamortized investments, net of accumulated amortization
Regulatory Assets
Total long-term	115	110
SCE | Unamortized losses on reacquired debt
Regulatory Assets
Total long-term	88	99
SCE | Environmental remediation
Regulatory Assets
Total long-term	222	226
SCE | Recovery assets
Regulatory Assets
Total long-term	$ 1,512	$ 1,558