Variable Interest Entities (Details) (Southern California Edison, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Series G Preferred Stock
Unconsolidated Trust
Security dividend rate, (as a percent)	5.10%
5.75% Series H (cumulative)
Unconsolidated Trust
Security dividend rate, (as a percent)	5.75%
Series F Preferred Stock
Unconsolidated Trust
Security dividend rate, (as a percent)	5.625%
Trust I | Trust Securities
Unconsolidated Trust
Security dividend rate, (as a percent)		5.625%
Liquidation value (in dollars per share)		$ 25
Common stock	10,000	$ 10,000	$ 10,000
Trust I | Series F Preferred Stock
Unconsolidated Trust
Liquidation preference	475,000,000	475,000,000	475,000,000
Liquidation value (in dollars per share)		$ 2,500
Trust II | Trust Securities
Unconsolidated Trust
Security dividend rate, (as a percent)			5.10%
Liquidation value (in dollars per share)			$ 25
Common stock	10,000		10,000
Trust II | Series G Preferred Stock
Unconsolidated Trust
Liquidation preference	400,000,000		400,000,000
Liquidation value (in dollars per share)			$ 2,500
Trust III | Trust Securities
Unconsolidated Trust
Security dividend rate, (as a percent)	5.75%
Liquidation value (in dollars per share)	25
Common stock	10,000
Trust III | 5.75% Series H (cumulative)
Unconsolidated Trust
Liquidation preference	275,000,000
Liquidation value (in dollars per share)	2,500
Variable Interest Entity, Not Primary Beneficiary | SCE Power Purchase Contracts
Details of projects or entities
Power generating capacity for majority interest (in megawatts)	5,641		5,183
Payments to unconsolidated VIEs for power purchase contracts	739,000,000		$ 715,000,000