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Commitments and Contingencies (Environmental Remediation) (Details)
 9 Months Ended
Sep. 30, 2016
USD ($)
site
Sep. 30, 2015
USD ($)
Aug. 31, 2016
USD ($)
Maximum      
Schedule Of Commitments And Contingencies [Line Items]      
Minimum liability for environmental remediation for immaterial sites     $ 74,500,000
Southern California Edison      
Schedule Of Commitments And Contingencies [Line Items]      
Identified material sites for environmental remediation (in number of sites) | site 19    
Minimum costs to be identified site $ 1,000,000    
Minimum liability for environmental remediation for material sites $ 130,000,000    
Immaterial sites for environmental remediation (in number of sites) | site 39    
Environmental remediation liability $ 134,000,000    
Regulatory assets related to environmental remediation 128,000,000    
Portion of recorded liability recoverable from incentive mechanism $ 46,000,000    
Percentage of environmental remediation costs recoverable through an incentive mechanism (as a percent) 90.00%    
Liability incurred at majority of the remaining sites through customer rates $ 82,000,000    
Environmental remediation costs to be recovered (as a percent) 100.00%    
Amount that cleanup costs could exceed recorded liability for identified material sites $ 166,000,000    
Amount that cleanup costs could exceed recorded liability for immaterial sites $ 8,000,000    
Remediation cost estimates (period) 4 years    
Environmental remediation costs $ 3,000,000 $ 5,000,000  
Southern California Edison | Minimum      
Schedule Of Commitments And Contingencies [Line Items]      
Minimum liability for environmental remediation for immaterial sites 4,000,000    
Expected annual environmental remediation costs $ 7,000,000    
Southern California Edison | Maximum      
Schedule Of Commitments And Contingencies [Line Items]      
Maximum expected period for cleanup of identified sites (in years) 30 years    
Expected annual environmental remediation costs $ 24,000,000    
Southern California Edison | San Onofre      
Schedule Of Commitments And Contingencies [Line Items]      
Minimum liability for environmental remediation for material sites $ 78,000,000