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Commitments and Contingencies (Wildfires litigation) (Details)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2021
USD ($)
Jan. 31, 2021
$ / claim
Oct. 31, 2020
USD ($)
$ / claim
Apr. 30, 2021
USD ($)
Mar. 31, 2023
USD ($)
plaintiff
Mar. 31, 2022
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
2017/2018 Wildfire/Mudslide Events                    
Commitments and Contingencies                    
Increase in accrued estimated losses         $ 90.0 $ 416.0        
Expected revenue through electric rates         6.0 26.0        
Total pre-tax charge         84.0 390.0        
Total after-tax charge         61.0 281.0        
Payments         221.0          
Charge for wildfire-related claims         988.0     $ 1,119.0    
2017/2018 Wildfire/Mudslide Events | Settled Litigation                    
Commitments and Contingencies                    
Charge for wildfire-related claims         135.0          
2017/2018 Wildfire/Mudslide Events | Settled Litigation | SED Settlement                    
Commitments and Contingencies                    
Charge for wildfire-related claims         120.0          
2017/2018 Wildfire/Mudslide Events | Pending Litigation                    
Commitments and Contingencies                    
Charge for wildfire-related claims         853.0          
2017/2018 Wildfire/Mudslide Events | Aggregate                    
Commitments and Contingencies                    
Payments         7,800.0          
Post-2018 Wildfires                    
Commitments and Contingencies                    
Increase in accrued estimated losses         6.0 105.0        
Total pre-tax charge         6.0 9.0        
Total after-tax charge         4.0 7.0        
Payments         7.0          
Charge for wildfire-related claims         681.0     682.0    
SCE                    
Commitments and Contingencies                    
Regulatory Assets         10,968.0     10,678.0    
SCE | 2017/2018 Wildfire/Mudslide Events                    
Commitments and Contingencies                    
Regulatory Assets         $ 63.0          
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement                    
Commitments and Contingencies                    
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           $ 148.0   $ 1,700.0 $ 1,700.0 $ 300.0
Number of plaintiffs | plaintiff         10,000          
SCE | 2017/2018 Wildfire/Mudslide Events | Settled Litigation | SED Settlement                    
Commitments and Contingencies                    
Charge for wildfire-related claims $ 550.0                  
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate                    
Commitments and Contingencies                    
Increase in accrued estimated losses         $ 8,800.0          
Expected revenue through electric rates         382.0          
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                    
Charge for wildfire-related claims         681.0          
Expected insurance recoveries         473.0          
Regulatory Assets         166.0          
SCE | Post-2018 Wildfires | Aggregate                    
Commitments and Contingencies                    
Increase in accrued estimated losses         702.0          
Expected revenue through electric rates         166.0          
Total after-tax charge         45.0          
Payments         21.0          
SCE | Post-2018 Wildfires | Aggregate | CPUC                    
Commitments and Contingencies                    
Expected revenue through electric rates         152.0          
SCE | Post-2018 Wildfires | Aggregate | FERC                    
Commitments and Contingencies                    
Expected revenue through electric rates         $ 14.0