Variable Interest Entities (Details) (Southern California Edison, USD $)	3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended						3 Months Ended	9 Months Ended		3 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014 SCE Trust I	Sep. 30, 2013 SCE Trust I	Sep. 30, 2014 SCE Trust I	Sep. 30, 2013 SCE Trust I	Sep. 30, 2014 SCE Trust I Trust Securities	Dec. 31, 2013 SCE Trust I Trust Securities	Sep. 30, 2014 SCE Trust I Series F Preferred Stock	Dec. 31, 2013 SCE Trust I Series F Preferred Stock	Sep. 30, 2014 SCE Trust II	Sep. 30, 2013 SCE Trust II	Sep. 30, 2014 SCE Trust II	Sep. 30, 2013 SCE Trust II	Sep. 30, 2014 SCE Trust II Trust Securities	Dec. 31, 2013 SCE Trust II Trust Securities	Sep. 30, 2014 SCE Trust II Series G Preferred Stock	Dec. 31, 2013 SCE Trust II Series G Preferred Stock	Sep. 30, 2014 SCE Trust III	Sep. 30, 2014 SCE Trust III	Sep. 30, 2014 SCE Trust III Trust Securities	Mar. 31, 2014 SCE Trust III Series H Preferred Stock	Sep. 30, 2014 SCE Trust III Series H Preferred Stock	Sep. 30, 2014 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW	Sep. 30, 2013 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW	Sep. 30, 2014 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW	Sep. 30, 2013 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW
Variable Interest Entity
Variable Interest Entities, Dividend Income	$ 7,000,000	$ 7,000,000	$ 20,000,000	$ 20,000,000					$ 5,000,000	$ 5,000,000	$ 15,000,000	$ 14,000,000					$ 4,000,000	$ 9,000,000
Variable Interest Entities, Dividend Distributions	7,000,000	7,000,000	20,000,000	20,000,000					5,000,000	5,000,000	15,000,000	14,000,000					4,000,000	9,000,000
Details of projects or entities
Power generating capacity (in megawatts)																						5,341	5,290	5,341	5,290
Payments to unconsolidated VIEs for power purchase contracts																						319,000,000	330,000,000	526,000,000	527,000,000
Future Power Generating Capacity of Projects Owned Controlled																						251		251
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					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