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Revenue (Deferred) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2023
Revenue    
Proceeds from Morongo Transmission LLC $ 400  
SCE    
Revenue    
Proceeds from Morongo Transmission LLC $ 400  
SCE | West of Devers    
Revenue    
Deferred revenue balance   $ 368
Deferred revenue current   13
Deferred revenue non-current   $ 355