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Variable Interest Entities (Recovery Funding) (Details) - USD ($)
$ in Millions
Jul. 12, 2019
Sep. 30, 2022
Mar. 31, 2022
Feb. 28, 2022
Dec. 31, 2021
Feb. 28, 2021
Variable Interest Entity [Line Items]            
Other current assets   $ 234     $ 249  
Regulatory assets: non-current   8,033     7,660  
Regulatory liabilities: current   702     603  
Current portion of long-term debt   2,175     1,077  
Other current liabilities   1,707     1,667  
Long-term debt   25,145     24,170  
SCE Recovery Funding LLC            
Variable Interest Entity [Line Items]            
Other current assets   49     19  
Regulatory assets: non-current   840     325  
Regulatory liabilities: current   24     14  
Current portion of long-term debt   25     14  
Other current liabilities   13     1  
Long-term debt   823     314  
SCE            
Variable Interest Entity [Line Items]            
Capital expenditures excluded $ 1,600          
Other current assets   228     222  
Regulatory assets: non-current   8,033     7,660  
Regulatory liabilities: current   702     603  
Current portion of long-term debt   1,475     377  
Other current liabilities   1,681     1,631  
Long-term debt   22,707     21,733  
SCE | Series 2022-A senior secured recovery bonds            
Variable Interest Entity [Line Items]            
Debt     $ 533      
SCE | SCE Recovery Funding LLC            
Variable Interest Entity [Line Items]            
Regulatory assets: non-current   840     325  
Long-term debt   $ 823     $ 314  
SCE | SCE Recovery Funding LLC | Series 2022-A senior secured recovery bonds            
Variable Interest Entity [Line Items]            
Debt       $ 533    
SCE | SCE Recovery Funding LLC | Series 2021-A senior secured recovery bonds            
Variable Interest Entity [Line Items]            
Debt           $ 338