Compensation and Benefit Plans (Expense Components) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 11		$ 14		$ 22		$ 28
Interest cost	27		26		54		52
Expected return on plan assets	(28)		(30)		(56)		(60)
Special Termination Benefits	0	[1]	10	[1]	0	[1]	10	[1]
Amortization of prior service cost	(9)		(9)		(18)		(18)
Amortization of net loss	0		7		0		14
Expense under accounting standards	1		18		2		26
Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	29		38		59		76
Interest cost	48		42		93		84
Expected return on plan assets	(60)		(57)		(117)		(114)
Settlement costs	0	[2]	49	[2]	0	[2]	49	[2]
Amortization of prior service cost	2		1		3		2
Amortization of net loss	1	[3]	15	[3]	2	[3]	30	[3]
Expense under accounting standards	20		88		40		127
Regulatory adjustment	30		(31)		61		(14)
Total expense recognized	50		57		101		113
Net loss reclassified	1		4		3		7
Southern California Edison | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	11		14		22		27
Interest cost	27		26		54		52
Expected return on plan assets	(28)		(30)		(56)		(60)
Special Termination Benefits	0	[1]	10	[1]	0	[1]	10	[1]
Amortization of prior service cost	(9)		(9)		(18)		(18)
Amortization of net loss	0		7		0		14
Expense under accounting standards	1		18		2		25
Southern California Edison | Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	29		37		58		74
Interest cost	44		41		88		82
Expected return on plan assets	(56)		(57)		(112)		(114)
Settlement costs	0	[2]	48	[2]	0	[2]	48	[2]
Amortization of prior service cost	1		1		2		2
Amortization of net loss	1	[3]	14	[3]	1	[3]	28	[3]
Expense under accounting standards	19		84		37		120
Regulatory adjustment	30		(31)		61		(14)
Total expense recognized	49		53		98		106
Net loss reclassified	$ 1		$ 3		$ 2		$ 5

[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 in 2013 from the SCE Retirement Plan (primarily due to workforce reductions described below).

[3] Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $1 million and $1 million, respectively, for the three months ended June 30, 2014, and $3 million and $2 million, respectively, for the six months ended June 30, 2014. The amount reclassified for Edison International and SCE was $4 million and $3 million, respectively, for the three months ended June 30, 2013, and $7 million and $5 million, respectively, for the six months ended June 30, 2013.