Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 857	$ 972
Long-term regulatory liabilities	8,395	8,385
Southern California Edison
Regulatory Liabilities [Line Items]
Current regulatory liabilities	857	972
Long-term regulatory liabilities	8,395	8,385
Total regulatory liabilities	9,252	9,357
Southern California Edison | Regulatory balancing and memorandum accounts
Regulatory Liabilities [Line Items]
Current regulatory liabilities	846	883
Long-term regulatory liabilities	1,337	1,261
Southern California Edison | Energy derivatives
Regulatory Liabilities [Line Items]
Current regulatory liabilities	0	80
Southern California Edison | Other
Regulatory Liabilities [Line Items]
Current regulatory liabilities	11	9
Long-term regulatory liabilities	34	41
Southern California Edison | Cost of removal
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,649	2,674
Southern California Edison | Re-measurement of deferred taxes
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,352	2,424
Southern California Edison | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	1,600	1,569
Southern California Edison | Other postretirement benefits
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	$ 423	$ 416