Income Taxes (Tax Rate Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Tax Disclosure [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%		35.00%		35.00%
Effective Tax Rate
Income from continuing operations before income taxes	$ 1,979		$ 1,221		$ 1,861
Provision for income tax at federal statutory rate of 35%	693		427		652
Repair deductions	0		0		(231)
State tax, net of federal benefit	56		18		108
Property-related	(252)	[1]	(216)	[1]	(223)	[1]
Accumulated deferred income tax adjustments	0		0		(41)
Change related to uncertain tax positions	5		14		40
San Onofre OII settlement	(23)		24		0
Other	(36)		(25)		(38)
Total income tax expense from continuing operations	443		242		267
Effective tax rate	22.40%		19.80%		14.30%
Southern California Edison
Effective Tax Rate
Income from continuing operations before income taxes	2,039		1,279		1,874
Provision for income tax at federal statutory rate of 35%	714		448		656
Repair deductions	0		0		(231)
State tax, net of federal benefit	55		34		54
Property-related	(252)	[1]	(216)	[1]	(223)	[1]
Accumulated deferred income tax adjustments	0		0		(41)
Change related to uncertain tax positions	12		14		36
San Onofre OII settlement	(23)		24		0
Other	(32)		(25)		(37)
Total income tax expense from continuing operations	$ 474		$ 279		$ 214
Effective tax rate	23.20%		21.80%		11.40%

[1] Includes incremental repair benefit recorded in 2012 to 2014. See discussion of repair deductions below.