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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Regulatory Liabilities [Line Items]    
Current regulatory liabilities $ 804 $ 756
Long-term regulatory liabilities 5,910 5,726
Southern California Edison    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 804 756
Long-term regulatory liabilities 5,910 5,726
Total regulatory liabilities 6,714 6,482
Southern California Edison | Regulatory balancing accounts    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 740 736
Long-term regulatory liabilities 1,278 1,180
Southern California Edison | San Onofre MHI arbitration award    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 47 0
Southern California Edison | Other    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 17 20
Long-term regulatory liabilities 59 60
Southern California Edison | Costs of removal    
Regulatory Liabilities [Line Items]    
Long-term regulatory liabilities 2,838 2,847
Southern California Edison | Recoveries in excess of ARO liabilities    
Regulatory Liabilities [Line Items]    
Long-term regulatory liabilities $ 1,735 $ 1,639