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Commitments and Contingencies (Wildfires and Mudslides) (Details)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2020
USD ($)
a
item
individual
Oct. 31, 2019
a
item
individual
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 30, 2018
a
item
individual
Jan. 31, 2018
item
individual
Dec. 04, 2017
a
item
individual
2019/2020 Wildfires              
Loss Contingencies [Line Items]              
Charge for wildfire-related claims | $     $ 118        
Expected insurance recoveries | $     75        
2017/2018 Wildfire/Mudslide Events              
Loss Contingencies [Line Items]              
Expected revenue from FERC customers | $     91        
Charge for wildfire-related claims | $     3,763 $ 4,383      
Expected insurance recoveries | $     666        
Aggregate settlement payments | $     $ 2,400        
SCE              
Loss Contingencies [Line Items]              
High fire risk service area, percent     27.00%        
SCE | Saddle Ridge Fire              
Loss Contingencies [Line Items]              
Acres burned | a   9,000          
Structures destroyed | item   19          
Structures damaged | item   88          
Fatalities | individual   1          
Number of injured firefighters | individual   8          
SCE | Bobcat fire              
Loss Contingencies [Line Items]              
Acres burned | a 116,000            
Number of injured firefighters | individual 6            
Estimated fire suppression costs | $ $ 80            
SCE | Bobcat fire | Homes              
Loss Contingencies [Line Items]              
Structures destroyed | item 87            
Structures damaged | item 28            
SCE | Bobcat fire | Commercial property              
Loss Contingencies [Line Items]              
Structures destroyed | item 1            
SCE | Bobcat fire | Minor structures              
Loss Contingencies [Line Items]              
Structures destroyed | item 83            
Structures damaged | item 19            
SCE | 2017/2018 Wildfire/Mudslide Events              
Loss Contingencies [Line Items]              
Expected revenue from FERC customers | $     $ 91        
Expected insurance recoveries | $     666 $ 708      
Expected FERC cumulative recoveries | $     233        
SCE | December 2017 - Thomas and Koenigstein Wildfires              
Loss Contingencies [Line Items]              
Expected insurance recoveries | $     0        
Acres burned | a             280,000
Structures destroyed | item             1,343
Fatalities | individual             2
SCE | November 2018 - Woolsey Wildfires              
Loss Contingencies [Line Items]              
Expected insurance recoveries | $     $ 666        
Acres burned | a         100,000    
Structures destroyed | item         1,643    
Structures damaged | item         364    
Fatalities | individual         3    
Additional fatalities | individual         2    
SCE | Montecito Mudslides              
Loss Contingencies [Line Items]              
Structures destroyed | item           135  
Structures damaged | item           324  
Fatalities | individual           21  
Additional fatalities presumed | individual           2