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Debt and Credit Agreements (Recovery and Term) (Details) - USD ($)
$ in Millions
Jan. 31, 2024
Dec. 31, 2023
Debt    
Outstanding borrowings   $ 1,804
SCE | 4.875% first and refunding mortgage bonds due in 2027    
Debt    
Debt, face amount $ 500  
Interest rate on debt (as a percent) 4.875%  
SCE | 5.20% first and refunding mortgage bonds due in 2034    
Debt    
Debt, face amount $ 900  
Interest rate on debt (as a percent) 5.20%