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Compensation and Benefit Plans (Workforce Reduction) (Details) (Southern California Edison, USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Employee severance
 
Restructuring Cost and Reserve [Line Items]  
Beginning balance $ 104
Additions 109
Payments (88)
Ending balance $ 125
San Onofre [Member]
 
Restructuring Cost and Reserve [Line Items]  
San Onofre expected number of positions to be eliminated 960