Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Effective Tax Rate
Income from continuing operations before income taxes	$ 487	$ 744	$ 1,324	$ 1,414
Provision for income tax at federal statutory rate of 35%	170	260	463	495
State tax, net of federal benefit	6	28	23	34
Property-related	(79)	(73)	(207)	(179)
Change related to uncertain tax positions	10	10	(53)	(4)
San Onofre OII settlement	0	0	0	(40)
Other	(25)	(5)	(31)	(22)
Total income tax expense from continuing operations	$ 82	$ 220	$ 195	$ 284
Effective tax rate	16.80%	29.60%	14.70%	20.10%
Federal statutory rate			35.00%
Southern California Edison
Effective Tax Rate
Income from continuing operations before income taxes	$ 509	$ 755	$ 1,370	$ 1,466
Provision for income tax at federal statutory rate of 35%	178	264	480	513
State tax, net of federal benefit	8	31	23	42
Property-related	(79)	(73)	(207)	(179)
Change related to uncertain tax positions	9	9	(56)	(1)
San Onofre OII settlement	0	0	0	(40)
Other	(24)	(7)	(33)	(25)
Total income tax expense from continuing operations	$ 92	$ 224	$ 207	$ 310
Effective tax rate	18.10%	29.70%	15.10%	21.10%
Federal statutory rate			35.00%