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Debt and Credit Agreements (Textual) (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
Mar. 31, 2019
USD ($)
extension
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Short-term debt     $ 932,000,000 $ 720,000,000
Multi-year revolving credit facility        
Debt Instrument [Line Items]        
Commitment     1,500,000,000.0  
Outstanding commercial paper     $ 153,000,000  
Weighted-average interest rate     3.03%  
Short-term debt       0
Southern California Edison        
Debt Instrument [Line Items]        
Short-term debt     $ 779,000,000 720,000,000
Southern California Edison | First and refunding mortgage bonds due 2029 | First and refunding mortgage bonds        
Debt Instrument [Line Items]        
Debt     $ 500,000,000  
Stated interest rate     4.20%  
Southern California Edison | First and refunding mortgage bonds due 2049 | First and refunding mortgage bonds        
Debt Instrument [Line Items]        
Debt     $ 600,000,000  
Stated interest rate     4.875%  
Southern California Edison | Term Loan Agreement        
Debt Instrument [Line Items]        
Debt   $ 750,000,000    
Southern California Edison | Term Loan Agreement | London Interbank Offered Rate        
Debt Instrument [Line Items]        
Variable rate basis points   0.70%    
Southern California Edison | Multi-year revolving credit facility        
Debt Instrument [Line Items]        
Commitment     $ 3,000,000,000  
Number of extension options | extension     2  
Southern California Edison | Multi-year revolving credit facility | Commercial paper        
Debt Instrument [Line Items]        
Outstanding commercial paper       $ 720,000,000
Weighted average interest rate       3.23%
Southern California Edison | Multi-year revolving credit facility | Letters of credit        
Debt Instrument [Line Items]        
Outstanding letters of credit     $ 209,000,000  
Letters of credit expiration period     12 months  
Southern California Edison | Multi-year revolving credit facility | Commercial paper        
Debt Instrument [Line Items]        
Outstanding commercial paper     $ 29,000,000  
Weighted average interest rate     3.15%  
Subsequent event | Term Loan Agreement        
Debt Instrument [Line Items]        
Debt $ 1,000,000,000.0      
Variable rate basis points 0.90%      
Southern California Edison | Subsequent event | Term Loan Agreement        
Debt Instrument [Line Items]        
Debt $ 750,000,000