Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Federal statutory income tax rate, percent		35.00%	35.00%	35.00%
Effective Tax Rate
Income from continuing operations before income taxes		$ 1,568	$ 1,979	$ 1,221
Provision for income tax at federal statutory rate of 35%		549	693	427
Regulatory asset write-off1	[1]	382	0	0
State tax, net of federal benefit		5	56	18
Property-related	[2]	(341)	(252)	(216)
Change related to uncertain tax positions		(67)	5	14
San Onofre OII settlement		0	(23)	24
Other		(42)	(36)	(25)
Total income tax expense from continuing operations		$ 486	$ 443	$ 242
Effective tax rate, percent		31.00%	22.40%	19.80%
Southern California Edison
Effective Tax Rate
Income from continuing operations before income taxes		$ 1,618	$ 2,039	$ 1,279
Provision for income tax at federal statutory rate of 35%		566	714	448
Regulatory asset write-off1	[1]	382	0	0
State tax, net of federal benefit		34	55	34
Property-related	[2]	(341)	(252)	(216)
Change related to uncertain tax positions		(94)	12	14
San Onofre OII settlement		0	(23)	24
Other		(40)	(32)	(25)
Total income tax expense from continuing operations		$ 507	$ 474	$ 279
Effective tax rate, percent		31.30%	23.20%	21.80%

[1] Includes federal and state.

[2] Includes incremental repair benefit recorded in 2013 to 2015. See discussion of repair deductions below.