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Compensation and Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Work force Reduction
San Onofre
Aug. 31, 2012
Work force Reduction
San Onofre
Minimum
positions
Aug. 31, 2012
Work force Reduction
San Onofre
Maximum
positions
Sep. 30, 2012
Pension Plans
Sep. 30, 2011
Pension Plans
Sep. 30, 2012
Pension Plans
Sep. 30, 2011
Pension Plans
Sep. 30, 2012
Pension Plans
Previous Estimate
Sep. 30, 2012
Postretirement Benefits Other Than Pensions
Sep. 30, 2011
Postretirement Benefits Other Than Pensions
Sep. 30, 2012
Postretirement Benefits Other Than Pensions
Sep. 30, 2011
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits                          
Plan year contributions         $ 154   $ 154   $ 263        
Employer contributions             136         15  
Additional plan year contributions                   47   47  
Requested recovery of plan contributions         168   168            
Expense components are:                          
Service cost         46 38 120 114   12 10 36 30
Interest cost         45 47 135 141   28 31 84 93
Expected return on plan assets         (52) (56) (162) (168)   (27) (27) (81) (81)
Special termination benefits                   3 [1] 0 [1] 3 [1] 0 [1]
Amortization of prior service cost (credit)         1 2 3 6   (9) (9) (27) (27)
Amortization of net loss         15 4 45 12   11 9 33 27
Total expense         55 35 141 105   18 14 48 42
Regulatory adjustment (deferred)         (57) (6) (3) (18)          
Total expense recognized         (2) 29 138 87          
After tax liability related to postretirment benefits to be assumed by Edison International 116                        
Cash severance costs   $ 30                      
Expected number of positions to be eliminated     730 1,500                  
[1] Due to the reduction in the workforce at San Onofre, SCE has incurred costs for enhanced retiree health care coverage. See below for further information.