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Debt and Credit Agreements (Details)
1 Months Ended 6 Months Ended
May 31, 2018
USD ($)
extension
Jan. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Apr. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Short-term debt     $ 2,393,000,000 $ 300,000,000    
Term Loan Agreement            
Debt Instrument [Line Items]            
Debt   $ 500,000,000        
London Interbank Offered Rate   0.60%        
4.125% Senior notes due 2028 | Senior notes            
Debt Instrument [Line Items]            
Debt           $ 550,000,000
Stated interest rate           4.125%
Multi-year revolving credit facility            
Debt Instrument [Line Items]            
Commitment $ 1,500,000,000.0       $ 1,250,000,000.00  
Short-term debt     $ 639,000,000 0    
Weighted average interest rate     1.70%      
Credit facility            
Debt Instrument [Line Items]            
Weighted average interest rate     2.56%      
Proceeds from credit facility     $ 500,000,000      
Repayments of credit facility   $ 500,000,000        
Southern California Edison            
Debt Instrument [Line Items]            
Short-term debt     $ 1,238,000,000 300,000,000    
Southern California Edison | 2.90% First and refunding mortgage bonds due 2021 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt           $ 450,000,000
Stated interest rate           2.90%
Southern California Edison | 3.65% First and refunding mortgage bonds due 2028 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt           $ 400,000,000
Stated interest rate           3.65%
Southern California Edison | 4.125% First and refunding mortgage bonds due 2048 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt           $ 400,000,000
Stated interest rate           4.125%
Southern California Edison | 3.40% First and refunding mortgage bonds due 2023 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt       $ 300,000,000    
Stated interest rate       3.40%    
Southern California Edison | 4.125% First and refunding mortgage bonds due 2048 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt       $ 350,000,000    
Stated interest rate       4.125%    
Southern California Edison | Multi-year revolving credit facility            
Debt Instrument [Line Items]            
Commitment $ 3,000,000,000       $ 2,750,000,000.00  
Number of extension options | extension 2          
Southern California Edison | Multi-year revolving credit facility | Commercial paper            
Debt Instrument [Line Items]            
Weighted average interest rate     1.75%      
Outstanding commercial paper     $ 738,000,000      
Southern California Edison | Multi-year revolving credit facility | Letters of credit            
Debt Instrument [Line Items]            
Outstanding letters of credit       $ 104,000,000    
Letters of credit expiration period       12 months    
Southern California Edison | Multi-year revolving credit facility | Commercial paper            
Debt Instrument [Line Items]            
Short-term debt       $ 300,000,000    
Weighted average interest rate       2.32%    
Southern California Edison | Credit facility            
Debt Instrument [Line Items]            
Weighted average interest rate     2.46%      
Proceeds from credit facility     $ 500,000,000      
Repayments of credit facility   $ 500,000,000