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Revenue (Summary of Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]            
Total operating revenue $ 3,741   $ 4,269 $ 9,377 $ 9,648  
Southern California Edison            
Disaggregation of Revenue [Line Items]            
Revenues from contracts with customers 3,884   4,106 8,642 9,514  
Alternative revenue programs and other operating revenue (152)   154 706 103  
Total operating revenue 3,732   4,260 9,348 9,617  
Receivables related to contracts from customers 1,500     1,500   $ 1,100
Accrued unbilled revenues 638     638   482
Franchise fees billed to customers 42   48 95 104  
Southern California Edison | CPUC | 2018 GRC            
Disaggregation of Revenue [Line Items]            
Reduction in revenue   $ 265        
Southern California Edison | CPUC | 2018 base rate revenue requirement            
Disaggregation of Revenue [Line Items]            
Final decision           $ 5,116
Southern California Edison | CPUC | 2019 base rate revenue requirement            
Disaggregation of Revenue [Line Items]            
Final decision       5,451    
Southern California Edison | Earning Activities            
Disaggregation of Revenue [Line Items]            
Revenues from contracts with customers 1,862   1,851 4,896 4,921  
Alternative revenue programs and other operating revenue (30)   (74) 23 (96)  
Total operating revenue 1,832   1,777 4,919 4,825  
Southern California Edison | Cost- Recovery Activities            
Disaggregation of Revenue [Line Items]            
Revenues from contracts with customers 2,022   2,255 3,746 4,593  
Alternative revenue programs and other operating revenue (122)   228 683 199  
Total operating revenue $ 1,900   $ 2,483 $ 4,429 $ 4,792