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Commitments and Contingencies (Wildfire Insurance) (Details) - SCE - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2024
May 31, 2023
Dec. 31, 2023
Sep. 30, 2024
Jun. 30, 2023
Commitments and Contingencies          
Wildfire insurance expense         $ 450.0
Customer-funded self-insurance          
Commitments and Contingencies          
Self-insurance fund value $ 1,000.0 $ 1,000.0      
Rate funded wildfire self-insurance program $ 300.0   $ 150.0 $ 300.0  
Shareholder contribution on self insurance (as a percent)   2.50%      
Threshold before shareholder contributions   $ 500.0      
Maximum annual shareholder contribution   $ 12.5      
Insurance coverage through June 2023          
Commitments and Contingencies          
Wildfire insurance coverage       1,000.0  
Self insurance       100.0  
Coverage net       937.0  
Commercial insurance carriers          
Commitments and Contingencies          
Wildfire insurance expense         $ 357.0
Commercial insurance carriers | Insurance coverage through June 2023          
Commitments and Contingencies          
Coverage net       835.0  
Edison Insurance Services-EIS | Insurance coverage through June 2023          
Commitments and Contingencies          
Coverage net       102.0  
Thomas and Koenigstein Fires and Montecito Mudslides-TKM          
Commitments and Contingencies          
Wildfire insurance coverage       1,000.0  
Self insurance       10.0  
November 2018-Woolsey          
Commitments and Contingencies          
Wildfire insurance coverage       1,000.0  
Self insurance       $ 10.0