Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 523	$ 603
Long-term regulatory liabilities	8,376	8,981
SCE
Regulatory Liabilities [Line Items]
Current regulatory liabilities	523	603
Long-term regulatory liabilities	8,376	8,981
Total regulatory liabilities	8,899	9,584
SCE | Revenue subject to refund
Regulatory Liabilities [Line Items]
Current regulatory liabilities	506	553
Long-term regulatory liabilities	822	648
SCE | Energy derivatives
Regulatory Liabilities [Line Items]
Current regulatory liabilities		25
SCE | Costs of removal
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,678	2,552
SCE | Re-measurement of deferred taxes
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,288	2,315
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,275	2,155
SCE | Pension and other postretirement benefits
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,289	1,281
SCE | Other regulatory assets or liabilities
Regulatory Liabilities [Line Items]
Current regulatory liabilities	17	25
Long-term regulatory liabilities	$ 24	$ 30