Compensation and Benefit Plans (Expense Components) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 14		$ 13		$ 42		$ 37
Interest cost	26		28		78		85
Expected return on plan assets	(30)		(27)		(90)		(81)
Special termination benefits	0	[1]	3	[1]	10	[1]	3	[1]
Amortization of prior service cost	(9)		(9)		(27)		(27)
Amortization of net loss	7	[2]	12	[2]	21	[2]	35	[2]
Expense under accounting standards	8		20		34		52
Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	38		44		114		121
Interest cost	42		46		126		137
Expected return on plan assets	(58)		(53)		(172)		(164)
Settlement costs	24	[3]	1	[3]	73	[3]	4	[3]
Amortization of prior service cost	1		1		3		3
Amortization of net loss	15	[4]	18	[4]	45	[4]	48	[4]
Expense under accounting standards	62		57		189		149
Regulatory adjustment (deferred)	(7)		(57)		(21)		(3)
Total expense recognized	55		0		168		146
Net loss reclassified	4				11
Net loss reclassified, settlement costs					2
Southern California Edison | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	14		12		41		36
Interest cost	26		28		78		84
Expected return on plan assets	(30)		(27)		(90)		(81)
Special termination benefits	0	[1]	3	[1]	10	[1]	3	[1]
Amortization of prior service cost	(9)		(9)		(27)		(27)
Amortization of net loss	7	[2]	11	[2]	21	[2]	33	[2]
Expense under accounting standards	8		18		33		48
Net loss reclassified	0				0
Southern California Edison | Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	37		46		111		120
Interest cost	41		45		123		135
Expected return on plan assets	(57)		(52)		(171)		(162)
Settlement costs	24		1		72		3
Amortization of prior service cost	1		1		3		3
Amortization of net loss	14	[4]	14	[4]	42	[4]	42	[4]
Expense under accounting standards	60		55		180		141
Regulatory adjustment (deferred)	(7)		(57)		(21)		(3)
Total expense recognized	53		(2)		159		138
Net loss reclassified	3				8
Maximum | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net loss reclassified	$ 1				$ 1

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

[2] Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was less than $1 million and zero 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 was $2 million for the nine months ended September 30, 2013.

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