Variable Interest Entities (Details) (Southern California Edison, USD $)	3 Months Ended		6 Months Ended		1 Months Ended						3 Months Ended		6 Months Ended		12 Months Ended						3 Months Ended	6 Months Ended		3 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014 SCE Trust I	Jun. 30, 2013 SCE Trust I	Jun. 30, 2014 SCE Trust I	Jun. 30, 2013 SCE Trust I	May 31, 2012 SCE Trust I Trust Securities	Jun. 30, 2014 SCE Trust I Trust Securities	Dec. 31, 2013 SCE Trust I Trust Securities	Jun. 30, 2014 SCE Trust I Series F Preferred Stock	Dec. 31, 2013 SCE Trust I Series F Preferred Stock	May 31, 2012 SCE Trust I Series F Preferred Stock	Jun. 30, 2014 SCE Trust II	Jun. 30, 2013 SCE Trust II	Jun. 30, 2014 SCE Trust II	Jun. 30, 2013 SCE Trust II	Dec. 31, 2013 SCE Trust II Trust Securities	Jun. 30, 2014 SCE Trust II Trust Securities	Jan. 31, 2013 SCE Trust II Trust Securities	Jun. 30, 2014 SCE Trust II Series G Preferred Stock	Dec. 31, 2013 SCE Trust II Series G Preferred Stock	Jan. 31, 2013 SCE Trust II Series G Preferred Stock	Jun. 30, 2014 SCE Trust III	Jun. 30, 2014 SCE Trust III	Jun. 30, 2014 SCE Trust III Trust Securities	Mar. 31, 2014 SCE Trust III Series H Preferred Stock	Jun. 30, 2014 SCE Trust III Series H Preferred Stock	Jun. 30, 2014 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW	Jun. 30, 2013 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW	Jun. 30, 2014 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW	Jun. 30, 2013 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW
Variable Interest Entity
Variable Interest Entities, Dividend Income	$ 6,000,000	$ 6,000,000	$ 13,000,000	$ 13,000,000							$ 5,000,000	$ 5,000,000	$ 10,000,000	$ 9,000,000							$ 4,000,000	$ 5,000,000
Variable Interest Entities, Dividend Distributions	6,000,000	6,000,000	13,000,000	13,000,000							5,000,000	5,000,000	10,000,000	9,000,000							4,000,000	5,000,000
Details of projects or entities
Power generating capacity (in megawatts)																										5,341	4,057	5,341	4,057
Payments to unconsolidated VIEs for power purchase contracts																										93,000,000	99,000,000	207,000,000	197,000,000
Future Power Generating Capacity of Projects Owned Controlled																										299		299
Unconsolidated Trust
Security dividend rate, (as a percent)					5.625%										5.10%								5.75%	5.75%
Liquidation preference					475,000,000	475,000,000	475,000,000	475,000,000	475,000,000						400,000,000	400,000,000	400,000,000	400,000,000	400,000,000				275,000,000		275,000,000
Liquidation value (in dollars per share)					$ 25					$ 2,500							$ 25			$ 2,500			$ 25	$ 2,500	$ 2,500
Common stock					$ 10,000	$ 10,000	$ 10,000								$ 10,000	$ 10,000	$ 10,000						$ 10,000