Variable Interest Entities (Details) (Southern California Edison, USD $)	3 Months Ended		1 Months Ended						3 Months Ended		1 Months Ended						3 Months Ended
	Mar. 31, 2014 SCE Trust I	Mar. 31, 2013 SCE Trust I	May 31, 2012 SCE Trust I Trust Securities	Mar. 31, 2014 SCE Trust I Trust Securities	Dec. 31, 2013 SCE Trust I Trust Securities	Mar. 31, 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	Mar. 31, 2014 SCE Trust II	Mar. 31, 2013 SCE Trust II	Jan. 31, 2013 SCE Trust II Trust Securities	Mar. 31, 2014 SCE Trust II Trust Securities	Dec. 31, 2013 SCE Trust II Trust Securities	Mar. 31, 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	Mar. 31, 2014 SCE Trust III	Mar. 31, 2014 SCE Trust III Trust Securities	Mar. 31, 2014 SCE Trust III Series H Preferred Stock	Mar. 31, 2014 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW	Mar. 31, 2013 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW
Details of projects or entities
Power generating capacity (in megawatts)																				5,641	3,578
Payments to unconsolidated VIEs for power purchase contracts																				$ 125,000,000	$ 98,000,000
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				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
Common stock			10,000	10,000	10,000						10,000	10,000	10,000					10,000
Dividend income and distributions	$ 7,000,000	$ 7,000,000							$ 5,000,000	$ 4,000,000							$ 1,000,000