Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Regulatory Liabilities
Current regulatory liabilities	$ 874	$ 763
Long-term regulatory liabilities	10,310	9,420
SCE
Regulatory Liabilities
Current regulatory liabilities	874	763
Long-term regulatory liabilities	10,310	9,420
Total regulatory liabilities	11,184	10,183
SCE | Regulatory balancing and memorandum accounts-Liabilities
Regulatory Liabilities
Current regulatory liabilities	830	704
Long-term regulatory liabilities	1,964	1,395
SCE | Costs of removal
Regulatory Liabilities
Long-term regulatory liabilities	2,603	2,635
SCE | Deferred income taxes
Regulatory Liabilities
Long-term regulatory liabilities	2,171	2,211
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities
Long-term regulatory liabilities	1,855	1,498
SCE | Pension and other postretirement benefits
Regulatory Liabilities
Long-term regulatory liabilities	1,695	1,664
SCE | Other regulatory assets or liabilities
Regulatory Liabilities
Current regulatory liabilities	44	59
Long-term regulatory liabilities	$ 22	$ 17