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Commitments and Contingencies (Wildfires litigation) (Details)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2021
USD ($)
Jan. 31, 2021
$ / claim
Oct. 31, 2020
USD ($)
$ / claim
Apr. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2022
USD ($)
plaintiff
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
2017/2018 Wildfire/Mudslide Events                          
Commitments and Contingencies                          
Increase in accrued estimated losses         $ 880.0     $ 1,265.0   $ 1,296.0 $ 1,265.0    
Expected revenue from FERC customers         50.0     67.0   76.0 67.0    
Total pre-tax charge         830.0     1,198.0   1,220.0 1,198.0    
Total after-tax charge         598.0     894.0   879.0 894.0    
Payments                   1,583.0      
Charge for wildfire-related claims         1,447.0         1,447.0   $ 1,734.0  
Regulatory Assets         163.0         163.0      
2017/2018 Wildfire/Mudslide Events | Settled Litigation                          
Commitments and Contingencies                          
Charge for wildfire-related claims         237.0         237.0      
2017/2018 Wildfire/Mudslide Events | Settled Litigation | SED Settlement                          
Commitments and Contingencies                          
Charge for wildfire-related claims         175.0         175.0      
2017/2018 Wildfire/Mudslide Events | Pending Litigation                          
Commitments and Contingencies                          
Charge for wildfire-related claims         1,200.0         1,200.0      
2017/2018 Wildfire/Mudslide Events | Aggregate                          
Commitments and Contingencies                          
Payments                   7,300.0      
Post-2018 Wildfires                          
Commitments and Contingencies                          
Increase in accrued estimated losses         415.0     5.0   565.0 7.0    
Expected revenue from FERC customers         162.0         162.0      
Total pre-tax charge         9.0     5.0   20.0 7.0    
Total after-tax charge         6.0     4.0   14.0 5.0    
Payments                   5.0      
Charge for wildfire-related claims         683.0         683.0   123.0  
SCE                          
Commitments and Contingencies                          
Regulatory Assets         9,530.0         9,530.0   9,438.0  
SCE | 2017/2018 Wildfire/Mudslide Events                          
Commitments and Contingencies                          
Regulatory Assets         163.0         $ 163.0      
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement                          
Commitments and Contingencies                          
Charge for wildfire-related claims $ 550.0                        
Third-party uninsured claims cost recovery waiver 375.0                        
Fine to State 110.0                        
Shareholder-funded safety measures costs $ 65.0                        
SCE | 2017/2018 Wildfire/Mudslide Events | Local Public Entity Settlements                          
Commitments and Contingencies                          
Payments                 $ 360.0        
SCE | 2017/2018 Wildfire/Mudslide Events | TKM Subrogation Settlement                          
Commitments and Contingencies                          
Payments     $ 1,200.0                    
Payment agreement for each dollar of claim | $ / claim     0.555                    
SCE | 2017/2018 Wildfire/Mudslide Events | Individual Plaintiff Settlements                          
Commitments and Contingencies                          
Payments         350.0 $ 400.0 $ 700.0         $ 1,700.0 $ 300.0
Number of plaintiffs | plaintiff                   8,500      
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate                          
Commitments and Contingencies                          
Increase in accrued estimated losses                   $ 8,800.0      
SCE | November 2018 Wildfires | Woolsey Subrogation Settlement                          
Commitments and Contingencies                          
Payments       $ 2,200.0                  
Payment agreement for each dollar of claim | $ / claim   0.67                      
SCE | Post-2018 Wildfires                          
Commitments and Contingencies                          
Increase in accrued estimated losses         415.0     5.0   565.0 7.0    
Expected revenue from FERC customers         162.0         162.0      
Total pre-tax charge               5.0   11.0 7.0    
Total after-tax charge               $ 4.0   8.0 $ 5.0    
SCE | Post-2018 Wildfires | Wildfire expense memorandum account                          
Commitments and Contingencies                          
Expected revenue from FERC customers                   (152.0)      
SCE | Post-2018 Wildfires | FERC balancing accounts                          
Commitments and Contingencies                          
Expected revenue from FERC customers                   (10.0)      
SCE | Post-2018 Wildfires | Aggregate                          
Commitments and Contingencies                          
Expected revenue from FERC customers                   166.0      
Total after-tax charge                   40.0      
Charge for wildfire-related claims         689.0         689.0      
Expected insurance recoveries         $ 467.0         $ 467.0