Commitments and Contingencies (Contingencies Textual) (Details) (USD $)	1 Months Ended	12 Months Ended	1 Months Ended		12 Months Ended		1 Months Ended		0 Months Ended	1 Months Ended
	Jun. 30, 2010	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Oct. 31, 2011 plaintiff	Feb. 01, 2012	Oct. 31, 2013	Aug. 31, 2014	Jun. 01, 2014
Schedule Of Commitments And Contingencies [Line Items]
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation	$ 142,000,000
Insurance Claims
Schedule Of Commitments And Contingencies [Line Items]
Federal Limit on Public Liability Claims from Nuclear Incident, Approximate		13,600,000,000
San Onofre | Insurance Claims
Schedule Of Commitments And Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss											433,000,000
Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Loss Contingency, Damages Sought, Value			84,000,000	98,000,000
Accrual for Environmental Loss Contingencies (material sites)		108,000,000
Number of Immaterial Sites for Environmental Remediation		38
Accrual for environmental loss contingencies (immaterial sites)		3,000,000
Accrued Environmental Loss Contingencies, Noncurrent		111,000,000
Regulatory Assets, Noncurrent, Environmental Remediation		107,000,000
Portion of Recorded Liability Recoverable From Incentive Mechanism		36,000,000
Percentage of Environmental Remediation Costs Recoverable From Incentive Mechanism		90.00%
Recorded Liability Incurred at Majority of Remaining Sites Through Customer Rates		71,000,000
Percentage of Environmental Remediation Costs to be Recovered		100.00%
Amount that Cleanup Costs for Identified Material Sites Could Exceed Recorded Liability		161,000,000
Amount that Cleanup Costs for Immaterial Sites Could Exceed Recorded Liability		7,000,000
Maximum Expected Period for Clean Up of Identified Sites		30 years
Expected Annual Environmental Remediation Costs, Period for Cost Estimates		5 years
Expected Annual Environmental Remediation Costs, Low End of Range		3,000,000
Expected Annual Environmental Remediation Costs, High End of Range		23,000,000
Environmental Remediation Expense		4,000,000			8,000,000	10,000,000
Insurance Coverage for Wildfire Liabilities Limit												547,500,000.0
Additional Coverage for Certain Wildfire Liabilities		450,000,000
Increase In Self Insurance Retention Per Wildfire Occurrence												10,000,000
Wildfire Threshold For Additional Coverage		550,000,000
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation	112,000,000
Southern California Edison | Amount Returned To Customers
Schedule Of Commitments And Contingencies [Line Items]
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation							94,000,000
Southern California Edison | Amount Returned To Shareholders
Schedule Of Commitments And Contingencies [Line Items]
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation							18,000,000
Southern California Edison | Insurance Claims
Schedule Of Commitments And Contingencies [Line Items]
Maximum Deferred Insurance Premium Per Nuclear Incident		255,000,000
Maximum Yearly Assessment Per Nuclear Incident		38,000,000
Limit on Assessment of Retrospective Premium Adjustments, Per Year, Approximate		52,000,000
Southern California Edison | Alleged violations of PSD requirements and New Source Performance Standards of the CAA
Schedule Of Commitments And Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs								4
Southern California Edison | San Onofre
Schedule Of Commitments And Contingencies [Line Items]
Period For Rate Recovery									10 years
Public Utilities, Approved Incentive, Percentage		5.00%
Accrual for Environmental Loss Contingencies (material sites)		70,000,000
Southern California Edison | San Onofre | Mitsubishi Heavy Industries Ltd
Schedule Of Commitments And Contingencies [Line Items]
Ratepayer Allocation of Recovery from Recoveries		50.00%
Entity Allocation of Recovery from Recoveries (under accidental outage insurance)		50.00%
Ratepayer Allocation of Recovery from Recoveries, Initial Amount of Settlement		282,000,000
Southern California Edison | San Onofre | Insurance Claims
Schedule Of Commitments And Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss											339,000,000
Reduction in Policy Benefits Following Retirement of Assets (under accidental outrage insurance)		90.00%
Ratepayer Allocation of Recovery from Recoveries		95.00%
Entity Allocation of Recovery from Recoveries (under accidental outage insurance)		5.00%
Southern California Edison | San Onofre | Other Insurance Claims
Schedule Of Commitments And Contingencies [Line Items]
Ratepayer Allocation of Recovery from Recoveries		82.50%
Entity Allocation of Recovery from Recoveries (under accidental outage insurance)		17.50%
Southern California Edison | San Onofre
Schedule Of Commitments And Contingencies [Line Items]
Annual Contribution to Environmental Remediation Study		4,000,000
Period of Environmental Remediation Study Contribution		5 years
Southern California Edison | Replacement Steam Generators | San Onofre
Schedule Of Commitments And Contingencies [Line Items]
Incremental Inspection and Repair Costs						99,000,000
Warranty Period		20 years
SCE And Other Owners Of San Onofre And Palo Verde | Insurance Claims
Schedule Of Commitments And Contingencies [Line Items]
Private Primary Insurance Purchased		375,000,000
SCE And Other Owners Of San Onofre And Palo Verde | Tort Claims For Onsite Workers
Schedule Of Commitments And Contingencies [Line Items]
Private Primary Insurance Purchased		375,000,000
SCE And Other Owners Of San Onofre And Palo Verde | San Onofre and Palo Verde | Insurance Claims
Schedule Of Commitments And Contingencies [Line Items]
Loss Limit, Property Damage Insurance, Federal Minimum Requirement		1,060,000,000
Edison International
Schedule Of Commitments And Contingencies [Line Items]
Number of Material Sites Identified for Environmental Remediation		20
Minimum costs to be Identified Material Site		1,000,000
Mitsubishi Heavy Industries Ltd | San Onofre
Schedule Of Commitments And Contingencies [Line Items]
Maximum Liability Per Purchase Agreement for Damages		138,000,000
Loss Contingency Counter Claim Amount										41,000,000
Mitsubishi Heavy Industries Ltd | Southern California Edison | San Onofre
Schedule Of Commitments And Contingencies [Line Items]
Loss Contingency, Damages Sought, Value										4,000,000,000
Number of Invoices for Reimbursement		7
Gain Contingency, Invoiced Amount for Reimbursement		149,000,000
Gain Contingency, Invoiced Amount Paid for Reimbursement		45,000,000
Public Utilities, Incremental Inspection and Repair Costs, Payments from Third Party						$ 35,000,000