Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Regulatory Liabilities
Current regulatory liabilities	$ 717	$ 964
Long-term regulatory liabilities	8,570	8,211
SCE
Regulatory Liabilities
Current regulatory liabilities	717	964
Long-term regulatory liabilities	8,570	8,211
Total regulatory liabilities	9,287	9,175
SCE | Regulatory balancing and memorandum accounts-Liabilities
Regulatory Liabilities
Current regulatory liabilities	685	584
Long-term regulatory liabilities	1,377	1,116
SCE | Energy derivatives
Regulatory Liabilities
Current regulatory liabilities		338
SCE | Costs of removal
Regulatory Liabilities
Long-term regulatory liabilities	2,673	2,589
SCE | Deferred income taxes
Regulatory Liabilities
Long-term regulatory liabilities	2,227	2,250
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities
Long-term regulatory liabilities	1,285	1,231
SCE | Pension and other postretirement benefits
Regulatory Liabilities
Long-term regulatory liabilities	984	1,007
SCE | Other regulatory assets or liabilities
Regulatory Liabilities
Current regulatory liabilities	32	42
Long-term regulatory liabilities	$ 24	$ 18