Compensation and Benefit Plans (Textual) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended					9 Months Ended
	Sep. 30, 2013	Aug. 31, 2013	Dec. 31, 2012	Sep. 30, 2013 Pension Plans	Sep. 30, 2013 Postretirement Benefits Other Than Pensions	Sep. 30, 2013 Southern California Edison	Aug. 31, 2013 Southern California Edison	Dec. 31, 2012 Southern California Edison	Sep. 30, 2013 Southern California Edison Pension Plans	Dec. 31, 2012 Initial	Aug. 31, 2013 Revised	May 31, 2013 Revised
Pension and Other Postretirement Benefits
Defined Benefit Plan, Actuarial Gain (Loss)	$ 338					$ 341
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate										3.75%	4.50%	4.25%
Defined Benefit Plan, Unfunded Status of Plan		739	1,110				701	1,070
Employer contributions				175	22				163
Estimated future contributions in remainder of 2013				$ 13	$ 13				$ 2