Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 701	$ 603
Long-term regulatory liabilities	8,867	8,981
SCE
Regulatory Liabilities [Line Items]
Current regulatory liabilities	701	603
Long-term regulatory liabilities	8,867	8,981
Total regulatory liabilities	9,568	9,584
SCE | Revenue subject to refund
Regulatory Liabilities [Line Items]
Current regulatory liabilities	603	553
Long-term regulatory liabilities	825	648
SCE | Energy derivatives
Regulatory Liabilities [Line Items]
Current regulatory liabilities	78	25
SCE | Costs of removal
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,694	2,552
SCE | Re-measurement of deferred taxes
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,302	2,315
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,760	2,155
SCE | Pension and other postretirement benefits
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,286	1,281
SCE | Other regulatory assets or liabilities
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 20	25
Long-term regulatory liabilities		$ 30