Regulatory Assets and Liabilities (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 603	$ 569
Long-term regulatory liabilities	8,981	8,589
SCE
Regulatory Liabilities [Line Items]
Current regulatory liabilities	603	569
Long-term regulatory liabilities	8,981	8,589
Total regulatory liabilities	9,584	9,158
SCE | Revenue subject to refund
Regulatory Liabilities [Line Items]
Current regulatory liabilities	553	471
Long-term regulatory liabilities	648	1,062
SCE | Energy derivatives
Regulatory Liabilities [Line Items]
Current regulatory liabilities	25	87
SCE | Other regulatory assets or liabilities
Regulatory Liabilities [Line Items]
Current regulatory liabilities	25	11
Long-term regulatory liabilities	30	48
SCE | Costs of removal
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,552	2,595
SCE | Re-measurement of deferred taxes
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,315	2,283
SCE | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,155	1,930
SCE | Other postretirement benefits
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	$ 1,281	$ 671