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Summary of Significant Accounting Policies (Revenue) (Details) - USD ($)
$ in Millions
 1 Months Ended
Nov. 30, 2021
Jun. 30, 2022
SCE    
Public Utilities, General Disclosures [Line Items]    
Revenue not yet approved   $ 85
2022 Formula Rate    
Public Utilities, General Disclosures [Line Items]    
Requested increase (decrease) revenue requirement $ 326  
Requested increase (decrease) revenue requirement (as a percent) 30.00%