Compensation and Benefit Plans (Expense Components) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Aug. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefits
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	$ (1)		$ 0		$ 1		$ 0
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Actuarial Gain (Loss)					158
Defined Benefit Plan, Funded Status of Plan									559	478
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	10		14		32		42
Interest cost	28		26		82		78
Expected return on plan assets	(28)		(30)		(84)		(90)
Special Termination Benefits	0	[1]	0	[1]	0	[1]	10	[1]
Amortization of prior service cost	(9)		(9)		(27)		(27)
Amortization of net loss	0		7		0		21
Expense under accounting standards	1		8		3		34
Pension Plans
Pension and Other Postretirement Benefits
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	2		0		2		2
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	30		38		89		114
Interest cost	48		42		141		126
Expected return on plan assets	(61)		(58)		(178)		(172)
Settlement costs	35	[2]	24	[2]	35	[2]	73	[2]
Amortization of prior service cost	1		1		4		3
Amortization of net loss	1	[3]	15	[3]	3	[3]	45	[3]
Expense under accounting standards	54		62		94		189
Regulatory adjustment	(2)		(7)		59		(21)
Total expense recognized	52		55		153		168
Net loss reclassified	2		4		5		11
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate (percent)									4.00%	4.75%
Southern California Edison
Pension and Other Postretirement Benefits
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	(1)		0		1		0
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Actuarial Gain (Loss)					146
Defined Benefit Plan, Funded Status of Plan									518	449
Southern California Edison | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	10		14		32		41
Interest cost	27		26		81		78
Expected return on plan assets	(28)		(30)		(84)		(90)
Special Termination Benefits	0	[1]	0	[1]	0	[1]	10	[1]
Amortization of prior service cost	(9)		(9)		(27)		(27)
Amortization of net loss	0		7		0		21
Expense under accounting standards	0		8		2		33
Southern California Edison | Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	29		37		87		111
Interest cost	44		41		132		123
Expected return on plan assets	(56)		(57)		(168)		(171)
Settlement costs	33	[2]	24	[2]	33	[2]	72	[2]
Amortization of prior service cost	1		1		3		3
Amortization of net loss	0	[3]	14	[3]	1	[3]	42	[3]
Expense under accounting standards	51		60		88		180
Regulatory adjustment	(2)		(7)		59		(21)
Total expense recognized	49		53		147		159
Net loss reclassified	$ 1		$ 3		$ 3		$ 8

[1] Due to the reduction in workforce, SCE has incurred costs for extended retiree health care coverage.

[2] Relates to lump-sum payments made to employees who retired from the SCE Retirement Plan (primarily due to workforce reductions described below). Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International was $2 million for the three and nine months ended September 30, 2014 and zero and $2 million for the three and nine months ended September 30, 2013, respectively.

[3] Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $2 million and $1 million, respectively, for the three months ended September 30, 2014, and $5 million and $3 million, respectively, for the nine months ended September 30, 2014. The amount reclassified for Edison International and SCE was $4 million and $3 million, respectively, for the three months ended September 30, 2013, and $11 million and $8 million, respectively, for the nine months ended September 30, 2013.