Compensation and Benefit Plans (Plan Assets and Benefit Obligation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended		12 Months Ended						12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Southern California Edison	Dec. 31, 2012 Southern California Edison	Dec. 31, 2013 Pension Plans		Dec. 31, 2012 Pension Plans		Aug. 31, 2013 Pension Plans	May 31, 2013 Pension Plans	Dec. 31, 2013 Pension Plans Southern California Edison		Dec. 31, 2012 Pension Plans Southern California Edison		Dec. 31, 2013 Postretirement Benefits Other Than Pensions		Dec. 31, 2012 Postretirement Benefits Other Than Pensions		Dec. 31, 2011 Postretirement Benefits Other Than Pensions	Dec. 31, 2013 Postretirement Benefits Other Than Pensions Southern California Edison		Dec. 31, 2012 Postretirement Benefits Other Than Pensions Southern California Edison		Dec. 31, 2011 Postretirement Benefits Other Than Pensions Southern California Edison
Change in projected benefit obligation
Benefit obligation at beginning of year					$ 4,948		$ 4,493				$ 4,434		$ 4,112		$ 2,460		$ 2,553			$ 2,452		$ 2,415
Service cost					174		179				154		156		49		47		40	48		47		40
Interest cost					182		196				164		176		98		108		115	97		108		114
Liability transferred to Edison International					0		23				0		(92)
Special termination benefits															11		2			11		2
Actuarial (gain) loss	(563)		(558)		(330)		370				(277)		318		(313)		(86)			(312)		(86)
Curtailment					0		26				0		0
Plan participants' contributions															18		16			18		16
Medicare Part D subsidy received															0		4			0		4
Benefits paid					(796)		(253)				(754)		(236)		(103)		(54)			(103)		(54)
Deconsolidation of EME					0	[1]	(34)	[1]			0	[1]	0	[1]	0	[2]	(130)	[2]		0	[2]	0	[2]
Benefit obligation at end of year					4,178		4,948				3,721		4,434		2,220		2,460		2,553	2,211		2,452		2,415
Change in plan assets
Fair value of plan assets at beginning of year					3,542		3,153				3,320		2,971		1,800		1,570			1,800		1,570
Actual return on plan assets					540		460				505		431		317		212			317		212
Employer contributions					191		182				165		154		33		52			33		52
Medicare Part D subsidy received															0		4			0		4
Benefits paid					(796)		(253)				(754)		(236)		(103)		(54)			(103)		(54)
Fair value of plan assets at end of year					3,477		3,542				3,236		3,320		2,065		1,800		1,570	2,065		1,800		1,570
Funded status at end of year	478	1,110	449	1,070	(701)		(1,406)				(485)		(1,114)		(155)		(660)			(146)		(652)
Amounts recognized in the consolidated balance sheets consist of:
Current liabilities					(15)		(19)				(5)		(6)		(17)		(18)			(16)		(18)
Long-term liabilities	(1,378)	(2,614)	(951)	(2,245)	(686)		(1,387)				(480)		(1,108)		(138)		(642)			(130)		(634)
Total liabilities					(701)		(1,406)				(485)		(1,114)		(155)		(660)			(146)		(652)
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss					30		127				33		40
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax					0		0				0		0		4		5			0		0
Amounts recognized as a regulatory asset (liability):
Prior service cost (credit)					25		30				25		30		(54)		(89)			(54)		(89)
Net loss					328		999				328		999		69		610			69		610
Total amounts recognized as regulatory asset					353		1,029				353		1,029		15		521			15		521
Total not yet recognized as expense					383		1,156				386		1,069		19		526			15		521
Accumulated benefit obligation at end of year					4,015		4,609				3,599		4,171
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation					4,178		4,948				3,721		4,434
Accumulated benefit obligation					4,015		4,609				3,599		4,171
Fair value of plan assets					$ 3,477		$ 3,542				$ 3,236		$ 3,320
Weighted-average assumptions used to determine obligations at end of year:
Discount rate					4.75%		3.75%		4.50%	4.25%	4.75%		3.75%		5.00%		4.25%			5.00%		4.25%
Rate of compensation increase					4.00%		4.50%				4.00%		4.50%
Rate assumed for following year															7.75%		8.50%			7.75%		8.50%
Ultimate rate															5.00%		5.00%			5.00%		5.00%
Year ultimate rate reached															2020		2020			2020		2020

[1] The retirement plan liabilities of EME have been deconsolidated as a result of the bankruptcy filing by EME, except for qualified pension plans that Edison International is jointly liable with EME under the Internal Revenue Code. See Note 16 for further information.

[2] The postretirement plan liabilities of EME have been deconsolidated as a result of the bankruptcy filing by EME. EME Homer City, a subsidiary of EME terminated the benefits of its employees in the PBOP Plan during 2012. In January 2014, EME settled and the Bankruptcy Court approved the settlement of all the EME Homer City employee claims to the EME Homer City PBOP Plan. EME has requested approval of the Bankruptcy Court to terminate the benefits of its employees and employees of its subsidiaries in the PBOP Plan upon confirmation of their Plan of Reorganization. Participation in the PBOP Plan by employees of EME and its subsidiaries (other than Homer City) has been permitted under EME's shared services agreement approved by the Bankruptcy Court subject to funding of paid claims. Edison International is not obligated to continue to provide benefits to EME employees under the PBOP Plan, nor can the VEBA Trusts be used to pay for benefits of EME participants. See Note 16 for further information.