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Debt and Credit Agreements (Details)
1 Months Ended 6 Months Ended
Aug. 01, 2019
USD ($)
May 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
extension
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
4.95% senior notes due 2025 | Senior notes            
Debt Instrument [Line Items]            
Debt     $ 400,000,000      
Stated interest rate     4.95%      
2.125% senior notes due 2020 | Senior notes            
Debt Instrument [Line Items]            
Stated interest rate     2.125%      
Repayments of outstanding debt     $ 400,000,000      
Term Loan Agreement            
Debt Instrument [Line Items]            
Debt       $ 800,000,000    
Term Loan Agreement | London Interbank Offered Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate       1.125%    
Multi-year revolving credit facility            
Debt Instrument [Line Items]            
Multi-year revolving credit facilities         $ 1,500,000,000  
Commitment         2,000,000,000.0  
Multi-year revolving credit facility | Commercial paper            
Debt Instrument [Line Items]            
Outstanding commercial paper         0 $ 0
Southern California Edison            
Debt Instrument [Line Items]            
Repurchased tax exempt pollution bonds     373,000,000      
Excluded wildfire risk mitigation capital expenditures $ 1,600,000,000     $ 1,600,000,000    
Southern California Edison | Revolving credit facility            
Debt Instrument [Line Items]            
Multi-year revolving credit facilities   $ 1,500,000,000   $ 800,000,000    
Amounts drawn against the revolving credit facility         0  
Number of 364-day extensions | extension       2    
Commitment       $ 1,100,000,000    
Southern California Edison | London Interbank Offered Rate | Revolving credit facility            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.50%   0.65%    
Southern California Edison | 4.20% first and refunding mortgage bonds due 2029 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt       $ 100,000,000    
Stated interest rate       2.85%    
Southern California Edison | 4.875% first and refunding mortgage bonds due 2049 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt       $ 500,000,000    
Stated interest rate       3.65%    
Southern California Edison | 2.25% first and refunding mortgage bonds due 2030 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt       $ 400,000,000    
Stated interest rate       2.25%    
Southern California Edison | 3.65% first and refunding mortgage bonds due 2050 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt       $ 700,000,000    
Stated interest rate       3.65%    
Southern California Edison | 3.70% first and refunding mortgage bonds due 2025 | First and refunding mortgage bonds            
Debt Instrument [Line Items]            
Debt     $ 600,000,000      
Stated interest rate     3.70%      
Southern California Edison | Term Loan Agreement            
Debt Instrument [Line Items]            
Debt       $ 475,000,000    
Southern California Edison | Term Loan Agreement | London Interbank Offered Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate       0.60%    
Southern California Edison | Multi-year revolving credit facility            
Debt Instrument [Line Items]            
Multi-year revolving credit facilities         3,000,000,000.0  
Commitment         4,000,000,000.0  
Southern California Edison | Multi-year revolving credit facility | Commercial paper            
Debt Instrument [Line Items]            
Outstanding commercial paper         0 $ 550,000,000
Weighted average interest rate           2.24%
Southern California Edison | Multi-year revolving credit facility | Letters of credit            
Debt Instrument [Line Items]            
Outstanding letters of credit         $ 75,000,000 $ 152,000,000
Letters of credit expiration period         12 months