Commitments and Contingencies (Details) (USD $)	1 Months Ended					9 Months Ended				1 Months Ended	9 Months Ended							9 Months Ended	1 Months Ended
	Jun. 30, 2010	Sep. 30, 2014 Southern California Edison site	Feb. 28, 2014 Southern California Edison	Dec. 31, 2011 Southern California Edison	Jun. 30, 2010 Southern California Edison	Sep. 30, 2014 Southern California Edison site	Sep. 30, 2013 Southern California Edison	Jun. 01, 2014 Southern California Edison	Feb. 28, 2014 San Gabriel Windstorm Investigation Southern California Edison	Oct. 31, 2011 Alleged violations of PSD requirements and New Source Performance Standards of the CAA Southern California Edison plaintiff	Sep. 30, 2014 Nuclear Insurance	Sep. 30, 2014 Nuclear Insurance Southern California Edison	Sep. 30, 2014 Nuclear Insurance SCE and other owners of San Onofre and Palo Verde	Sep. 30, 2014 Tort claims for onsite workers SCE and other owners of San Onofre and Palo Verde	Sep. 30, 2014 San Onofre (nuclear) Southern California Edison	Jun. 28, 2014 San Onofre (nuclear) Nuclear Insurance	Jun. 28, 2014 San Onofre (nuclear) Nuclear Insurance Southern California Edison	Sep. 30, 2014 San Onofre and Palo Verde Nuclear Insurance SCE and other owners of San Onofre and Palo Verde	Dec. 31, 2013 Amount Returned To Customers [Member] Southern California Edison	Dec. 31, 2013 Amount Returned To Shareholders [Member] Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
San Bernardino settlement amount									$ 24,500,000							$ 427,000,000	$ 334,000,000
Litigation Settlement Penalties Paid to State			15,000,000
Number of plaintiffs in Four Corners environmental matters										4
Identified material sites for environmental remediation (in number of sites)		20				20
Minimum costs to be Identified Site						1,000,000
Minimum liability for environmental remediation for material sites		110,000,000				110,000,000									72,000,000
Immaterial sites for environmental remediation (in number of sites)						38
Total minimum recorded liability for immaterial sites		3,000,000				3,000,000
Environmental remediation liability		113,000,000				113,000,000
Regulatory assets related to environmental remediation		109,000,000				109,000,000
Portion of recorded liability recoverable from incentive mechanism						37,000,000
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		72,000,000				72,000,000
Environmental remediation costs to be recovered (as a percent)						100.00%
Amount that cleanup costs could exceed recorded liability for identified material sites						159,000,000
Amount that cleanup costs could exceed recorded liability for immaterial sites						7,000,000
Maximum expected period for cleanup of identified sites (in years)						30 years
Expected annual environmental remediation costs, low end of range						4,800,000
Expected annual environmental remediation costs, high end of range						31,100,000
Environmental remediation costs						3,000,000	5,000,000
Federal limit on public liability claims from nuclear incident, approximate											13,600,000,000
Private primary insurance purchased													375,000,000	375,000,000
Maximum assessment per each nuclear incident												255,000,000
Maximum yearly assessment per nuclear incident												38,000,000
Loss limit, property damage insurance, federal minimum requirement																		1,060,000,000
Limit on assessment of retrospective premium adjustments, per year, approximate												52,000,000
Insurance coverage for wildfire liabilities Limit		450,000,000				450,000,000		547,500,000.0
Self insurance retention per wildfire occurrence								10,000,000
Wildfire Threshold For Additional Coverage		550,000,000				550,000,000
Amount of damages, decision by US Court of Federal Claims, spent nuclear fuel litigation	142,000,000				112,000,000														94,000,000	18,000,000
Damages sought		$ 84,000,000		$ 98,000,000											$ 4,000,000,000