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OTHER CONTINGENCIES AND COMMITMENTS (Interim Rate Relief Subject to Refund) (Details) - WMCE Interim Rate Relief - USD ($)
$ in Millions
Sep. 30, 2022
Oct. 23, 2020
Sep. 30, 2020
Loss Contingencies [Line Items]      
Expenses and capital expenditures, disallowed costs     $ 1,180
Expenses and capital expenditures, capital expenditures     801
Cost recovery, increase (decrease) to revenue requirement     $ 1,280
Interim rate relief   $ 447  
Cost recovery, remaining revenue requirement   $ 868  
Fire hazard prevention memorandum account      
Loss Contingencies [Line Items]      
Cost recovery $ 293    
Fire risk and wildfire mitigation memorandum account      
Loss Contingencies [Line Items]      
Cost recovery 740    
Catastrophic event memorandum account      
Loss Contingencies [Line Items]      
Cost recovery $ 251