Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax		$ 0	$ 3
Other		0	2
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost		46	40	$ 49
Interest cost		102	117	98
Expected return on plan assets		(116)	(108)	(114)
Special termination benefits	[1]	(1)	(3)	(11)
Amortization of prior service cost		(12)	(36)	(36)
Amortization of net loss		3	6	24
Expense under accounting standards		24	22	32
Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost		142	133
Interest cost		170	181
Other		14	9
Southern California Edison
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Other		0	2
Southern California Edison | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost		46	40	48
Interest cost		102	117	97
Expected return on plan assets		(116)	(108)	(114)
Special termination benefits	[1]	(1)	(3)	(11)
Amortization of prior service cost		(12)	(35)	(35)
Amortization of net loss		2	5	24
Expense under accounting standards		23	22	31
Southern California Edison | Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost		133	124
Interest cost		150	159
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax		(18)	(22)
Other		(8)	(4)
Continuing Operations | Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost		142	133	162
Interest cost		170	181	170
Expected return on plan assets		(233)	(229)	(222)
Settlement costs	[2]	0	45	87
Curtailment gain		0	(4)	0
Amortization of prior service cost		5	5	5
Amortization of net loss	[3]	40	12	39
Expense under accounting standards		124	143	241
Regulatory adjustment (deferred)		(6)	8	(53)
Total expense recognized		118	151	188
Continuing Operations | Southern California Edison | Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost		139	128	159
Interest cost		155	164	167
Expected return on plan assets		(217)	(213)	(222)
Settlement costs	[2]	0	42	85
Curtailment gain		0	0	0
Amortization of prior service cost		5	5	5
Amortization of net loss	[3]	35	7	35
Expense under accounting standards		117	133	229
Regulatory adjustment (deferred)		(6)	8	(53)
Total expense recognized		$ 111	$ 141	$ 176

[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 was zero for the year ended December 31, 2015 and $3 million for the year ended December 31, 2014.

[3] Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $14 million and $8 million, respectively, for the year ended December 31, 2015. The amount reclassified for Edison International and SCE was $9 million and $4 million, respectively, for the year ended December 31, 2014.