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Debt and Credit Agreements (Textual) (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2021
USD ($)
Debt Instrument [Line Items]      
Debt covenant capitalization ratio   0.70  
Actual debt to capitalization ratio   0.59  
SCE      
Debt Instrument [Line Items]      
Debt covenant capitalization ratio   0.65  
Actual debt to capitalization ratio   0.51  
SCE | Mortgages      
Debt Instrument [Line Items]      
Debt, face amount   $ 900,000,000  
SCE | LIBOR | Mortgages      
Debt Instrument [Line Items]      
Basis spread on variable rate   0.27%  
SCE | March 2020 term loan agreement | Revolving Credit Facility      
Debt Instrument [Line Items]      
Drawn against the revolving credit facility $ 800,000,000    
SCE | March 2020 term loan agreement | Revolving Credit Facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.125% 0.65%  
SCE | 2.95% First and Refunding Mortgage Bonds Due in 2051 | Mortgages | Subsequent event      
Debt Instrument [Line Items]      
Debt, face amount     $ 750,000,000
Interest rate on debt (as a percent)     2.95%
SCE | 2.25% First and Refunding Mortgage Bonds Due in 2030 | Mortgages | Subsequent event      
Debt Instrument [Line Items]      
Debt, face amount     $ 150,000,000
Interest rate on debt (as a percent)     2.25%