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Debt and Credit Agreements (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 30, 2017
Mar. 31, 2017
Sep. 30, 2017
Aug. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Non-recourse debt     $ 12,221,000,000   $ 11,156,000,000
Short-term debt     908,000,000   1,307,000,000
Multi-year revolving credit facility          
Debt Instrument [Line Items]          
Commitment     1,250,000,000.00    
Short-term debt     $ 573,000,000   $ 538,000,000
Weighted average interest rate     1.37%   0.97%
Southern California Edison          
Debt Instrument [Line Items]          
Non-recourse debt     $ 11,005,000,000   $ 10,333,000,000
Short-term debt     329,000,000   $ 769,000,000
Southern California Edison | First and refunding mortgage bonds          
Debt Instrument [Line Items]          
Debt     1,000,000,000    
Southern California Edison | Term Loan Agreement          
Debt Instrument [Line Items]          
Debt   $ 300,000,000      
London Interbank Offered Rate   65.00%      
Southern California Edison | Pollution-control bonds          
Debt Instrument [Line Items]          
Debt   $ 135,000,000      
Stated interest rate   2.625%      
Southern California Edison | 4.00% First and refunding mortgage bonds due 2047 | First and refunding mortgage bonds          
Debt Instrument [Line Items]          
Debt   $ 700,000,000      
Stated interest rate   4.00%      
Southern California Edison | Reissued 4.00% first and refunding mortgage bonds due 2047 | First and refunding mortgage bonds          
Debt Instrument [Line Items]          
Debt     300,000,000    
Southern California Edison | 2.125% Senior notes due 2020 | Senior notes          
Debt Instrument [Line Items]          
Debt   $ 400,000,000      
Stated interest rate   2.125%      
Southern California Edison | 2.40% Senior notes due 2022 | Senior notes          
Debt Instrument [Line Items]          
Debt       $ 400,000,000  
Stated interest rate       2.40%  
Southern California Edison | 3.75% Senior notes | Senior notes          
Debt Instrument [Line Items]          
Debt     $ 400,000,000    
Stated interest rate     3.75%    
Southern California Edison | Multi-year revolving credit facility          
Debt Instrument [Line Items]          
Commitment     $ 2,750,000,000.00    
Southern California Edison | Multi-year revolving credit facility | Commercial paper          
Debt Instrument [Line Items]          
Weighted average interest rate         0.90%
Outstanding borrowings         $ 769,000,000
Southern California Edison | Multi-year revolving credit facility | Letters of credit          
Debt Instrument [Line Items]          
Outstanding letters of credit     $ 267,000,000    
Letters of credit expiration period     12 months    
Southern California Edison | Multi-year revolving credit facility | Commercial paper          
Debt Instrument [Line Items]          
Short-term debt     $ 329,000,000    
Weighted average interest rate     1.29%    
Indirect subsidiaries | Nonrecourse Ground Mount Solar Project, Equity Investment Financing [Member] | Subsequent event          
Debt Instrument [Line Items]          
Non-recourse debt $ 100,000,000        
Initial allocation of taxable losses and tax credits 99.00%        
Allocation of taxable income and losses after initial period 67.00%        
Allocation of cash flow 15.60%        
Term of agreement 20 years