Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Regulatory Liabilities
Current regulatory liabilities	$ 988	$ 763
Long-term regulatory liabilities	9,814	9,420
SCE
Regulatory Liabilities
Current regulatory liabilities	988	763
Long-term regulatory liabilities	9,814	9,420
Total regulatory liabilities	10,802	10,183
SCE | Regulatory balancing and memorandum accounts-Liabilities
Regulatory Liabilities
Current regulatory liabilities	947	704
Long-term regulatory liabilities	1,673	1,395
SCE | Costs of removal
Regulatory Liabilities
Long-term regulatory liabilities	2,626	2,635
SCE | Deferred income taxes
Regulatory Liabilities
Long-term regulatory liabilities	2,199	2,211
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities
Long-term regulatory liabilities	1,627	1,498
SCE | Pension and other postretirement benefits
Regulatory Liabilities
Long-term regulatory liabilities	1,674	1,664
SCE | Other regulatory assets or liabilities
Regulatory Liabilities
Current regulatory liabilities	41	59
Long-term regulatory liabilities	$ 15	$ 17