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Fair Value Measurements (Parent) (Details) - Edison International Parent and Other - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Level 1    
Fair Value    
Equity investments fair value $ 5 $ 12
Money market funds fair value 137 99
Level 2    
Fair Value    
Short-term investments fair value $ 2 $ 6