Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 702	$ 603
Long-term regulatory liabilities	8,348	8,981
SCE
Regulatory Liabilities [Line Items]
Current regulatory liabilities	702	603
Long-term regulatory liabilities	8,348	8,981
Total regulatory liabilities	9,050	9,584
SCE | Revenue subject to refund
Regulatory Liabilities [Line Items]
Current regulatory liabilities	648	553
Long-term regulatory liabilities	1,043	648
SCE | Energy derivatives
Regulatory Liabilities [Line Items]
Current regulatory liabilities	22	25
SCE | Costs of removal
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,648	2,552
SCE | Re-measurement of deferred taxes
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,267	2,315
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,071	2,155
SCE | Pension and other postretirement benefits
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,293	1,281
SCE | Other regulatory assets or liabilities
Regulatory Liabilities [Line Items]
Current regulatory liabilities	32	25
Long-term regulatory liabilities	$ 26	$ 30