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Debt and Credit Agreements (Textual) (Details)
1 Months Ended
Feb. 28, 2019
USD ($)
May 31, 2018
USD ($)
extension
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Debt Instrument [Line Items]          
Number of one year extension options | extension   2      
Line of credit          
Debt Instrument [Line Items]          
Weighted average interest rate (as a percent)     2.56%    
Multi-year credit facilities          
Debt Instrument [Line Items]          
Commitment   $ 1,500,000,000   $ 1,500,000,000 $ 1,250,000,000
Outstanding borrowings     $ 639,000,000 0  
Weighted average interest rate (as a percent)     1.70%    
Outstanding letters of credit       $ 0  
Term Loan Agreement | Subsequent event          
Debt Instrument [Line Items]          
Debt, face amount $ 750,000,000        
SCE          
Debt Instrument [Line Items]          
Debt to total capitalization ratio       0.65  
SCE | Line of credit          
Debt Instrument [Line Items]          
Weighted average interest rate (as a percent)     2.46%    
Borrowings from credit facility     $ 500,000,000    
SCE | Multi-year credit facilities          
Debt Instrument [Line Items]          
Commitment   $ 3,000,000,000   $ 3,000,000,000 $ 2,750,000,000
Number of one year extension options | extension   2      
Outstanding borrowings       721,000,000  
Outstanding letters of credit       $ 190,000,000  
SCE | Multi-year credit facilities | Commercial paper          
Debt Instrument [Line Items]          
Outstanding borrowings     $ 738,000,000    
Weighted average interest rate (as a percent)     1.75% 3.23%  
SCE | Multi-year credit facilities | Letters of credit          
Debt Instrument [Line Items]          
Outstanding letters of credit       $ 190,000,000  
SCE | Commercial paper supported by SCE's credit facility | Commercial paper          
Debt Instrument [Line Items]          
Outstanding borrowings       $ 720,000,000  
London Interbank Offered Rate | SCE | Term Loan Agreement | Subsequent event          
Debt Instrument [Line Items]          
Basis points 0.70%