Income Taxes (Tax Rate Reconciliation) (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
Effective Tax Rate
Income from continuing operations before income taxes	$ 744	$ 665	$ 1,414	$ 863
Provision for income tax at federal statutory rate of 35%	260	233	495	302
State tax, net of federal benefit	28	22	34	5
Property-related	(73)	(57)	(179)	(121)
Change related to uncertain tax positions	10	(5)	(4)	13
San Onofre OII settlement	0	0	(40)	0
Other	(5)	(16)	(22)	(26)
Total income tax expense from continuing operations	220	177	284	173
Effective Tax Rate Excluding Income Attributable to Noncontrolling Interests	29.60%	26.60%	20.10%	20.00%
Federal statutory rate	35.00%	35.00%	35.00%	35.00%
Southern California Edison
Effective Tax Rate
Income from continuing operations before income taxes	755	685	1,466	913
Provision for income tax at federal statutory rate of 35%	264	240	513	319
State tax, net of federal benefit	31	21	42	12
Property-related	(73)	(57)	(179)	(121)
Change related to uncertain tax positions	9	(6)	(1)	11
San Onofre OII settlement	0	0	(40)	0
Other	(7)	(15)	(25)	(25)
Total income tax expense from continuing operations	$ 224	$ 183	$ 310	$ 196
Effective Tax Rate Excluding Income Attributable to Noncontrolling Interests	29.70%	26.70%	21.10%	21.50%
Federal statutory rate	35.00%	35.00%	35.00%	35.00%