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Compensation and Benefit Plans (Workforce Reduction) (Details) (Southern California Edison, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2013
positions
Sep. 30, 2013
positions
Employee severance
   
Restructuring Cost and Reserve [Line Items]    
Beginning balance   $ 104
Additions   109
Payments   (132)
Ending balance   $ 81
San Onofre [Member]
   
Restructuring Cost and Reserve [Line Items]    
San Onofre expected number of positions to be eliminated 960 960
Support Organizations, Expected Number of Positions to Be Eliminated   175