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Revenue (Summary of Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]          
Total operating revenue $ 2,812 $ 2,815 $ 5,636 $ 5,379  
Southern California Edison          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 2,299 2,680 4,758 5,408  
Alternative revenue programs and other operating revenue 501 123 858 (51)  
Total operating revenue 2,800 2,803 5,616 5,357  
Receivables related to contracts from customers 1,200   1,200   $ 1,100
Accrued unbilled revenues 562   562   482
Franchise fees billed to customers 25 29 53 57  
Southern California Edison | CPUC | 2018 GRC          
Disaggregation of Revenue [Line Items]          
Total operating 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 1,532 1,534 3,034 3,070  
Alternative revenue programs and other operating revenue 5 1 53 (22)  
Total operating revenue 1,537 1,535 3,087 3,048  
Southern California Edison | Cost- Recovery Activities          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 767 1,146 1,724 2,338  
Alternative revenue programs and other operating revenue 496 122 805 (29)  
Total operating revenue $ 1,263 $ 1,268 $ 2,529 $ 2,309