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Debt and Credit Agreements (Textual) (Details)
1 Months Ended 9 Months Ended
Aug. 31, 2018
USD ($)
May 31, 2018
USD ($)
extension
Jan. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Apr. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Short-term debt       $ 2,393,000,000 $ 103,000,000    
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       $ 1,238,000,000 103,000,000    
Southern California Edison | First and refunding mortgage bonds              
Debt Instrument [Line Items]              
Proceeds from issuance of debt $ 850,000,000            
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
Repayments of First Mortgage Bond         400,000,000    
Stated interest rate             3.65%
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         $ 264,000,000    
Letters of credit expiration period         12 months    
Southern California Edison | Multi-year revolving credit facility | Commercial paper              
Debt Instrument [Line Items]              
Short-term debt         $ 103,000,000    
Weighted average interest rate         2.38%    
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