Compensation and Benefit Plans (Expense Components) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 11		$ 14
Interest cost	27		26
Expected return on plan assets	(28)		(30)
Amortization of prior service cost	(9)		(9)
Amortization of net loss	0		7
Total expense recognized	1		8
Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	30		38
Interest cost	45		42
Expected return on plan assets	(57)		(57)
Amortization of prior service cost	1		1
Amortization of net loss	1	[1]	15	[1]
Expense under accounting standards	20		39
Regulatory adjustment	31		17
Total expense recognized	51		56
Net loss reclassified	2		3
Southern California Edison | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	11		13
Interest cost	27		26
Expected return on plan assets	(28)		(30)
Amortization of prior service cost	(9)		(9)
Amortization of net loss	0		7
Total expense recognized	1		7
Southern California Edison | Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	29		37
Interest cost	44		41
Expected return on plan assets	(56)		(57)
Amortization of prior service cost	1		1
Amortization of net loss	0	[1]	14	[1]
Expense under accounting standards	18		36
Regulatory adjustment	31		17
Total expense recognized	49		53
Net loss reclassified	$ 1		$ 2

[1] 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 for the three months ended March 31, 2014, respectively, and $3 million and $2 million for the three months ended March 31, 2013, respectively.