Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 425	$ 964
Long-term regulatory liabilities	8,555	8,211
SCE
Regulatory Liabilities [Line Items]
Current regulatory liabilities	425	964
Long-term regulatory liabilities	8,555	8,211
Total regulatory liabilities	8,980	9,175
SCE | Revenue subject to refund
Regulatory Liabilities [Line Items]
Current regulatory liabilities	302	584
Long-term regulatory liabilities	1,317	1,116
SCE | Energy derivatives
Regulatory Liabilities [Line Items]
Current regulatory liabilities	74	338
SCE | Costs of removal
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,608	2,589
SCE | Re-measurement of deferred taxes
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,237	2,250
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,378	1,231
SCE | Pension and other postretirement benefits
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	999	1,007
SCE | Other regulatory assets or liabilities
Regulatory Liabilities [Line Items]
Current regulatory liabilities	49	42
Long-term regulatory liabilities	$ 16	$ 18