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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Regulatory Liabilities [Line Items]    
Current regulatory liabilities $ 764 $ 972
Long-term regulatory liabilities 8,113 8,385
Southern California Edison    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 764 972
Long-term regulatory liabilities 8,113 8,385
Total regulatory liabilities 8,877 9,357
Southern California Edison | Regulatory balancing and memorandum accounts    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 749 883
Long-term regulatory liabilities 1,356 1,261
Southern California Edison | Energy derivatives    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 3 80
Southern California Edison | Other    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 12 9
Long-term regulatory liabilities 34 41
Southern California Edison | Cost of removal    
Regulatory Liabilities [Line Items]    
Long-term regulatory liabilities 2,670 2,674
Southern California Edison | Re-measurement of deferred taxes    
Regulatory Liabilities [Line Items]    
Long-term regulatory liabilities 2,388 2,424
Southern California Edison | Recoveries in excess of ARO liabilities    
Regulatory Liabilities [Line Items]    
Long-term regulatory liabilities 1,245 1,569
Southern California Edison | Other postretirement benefits    
Regulatory Liabilities [Line Items]    
Long-term regulatory liabilities $ 420 $ 416