Income Taxes (Textual) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Loss Carryforwards	[1]	$ 1,136	$ 1,136
Less valuation allowance		32	$ 32	$ 29
Rate Base Offset Amortization Period			27 years
Unrecognized tax benefits that would impact the effective tax rate		440	$ 440	503
Southern California Edison
Income Tax Disclosure [Line Items]
Loss Carryforwards	[1]	39	39
Less valuation allowance		0	0	0
Unrecognized tax benefits that would impact the effective tax rate		256	256	370
Disallowance of Repair Allowance Deduction
Income Tax Disclosure [Line Items]
Federal tax liability				$ (133)	$ (89)
Disallowance of Repair Allowance Deduction | Southern California Edison
Income Tax Disclosure [Line Items]
Federal tax liability		(382)
Deferred Tax Rate Base Offset		324	324
Tax Years 2007 to 2009 | Disallowance of Repair Allowance Deduction | Southern California Edison | IRS Examination
Income Tax Disclosure [Line Items]
Federal tax liability			64
Tax Years 2010 to 2012, Federal | IRS Examination
Income Tax Disclosure [Line Items]
Federal tax liability			94
Tax Years 2010 to 2012, Federal | Disallowance of Repair Allowance Deduction | Southern California Edison | IRS Examination
Income Tax Disclosure [Line Items]
Federal tax liability			9
Tax Years 2010 to 2012, State | IRS Examination
Income Tax Disclosure [Line Items]
Federal tax liability			100
Stock Compensation Plan
Income Tax Disclosure [Line Items]
Loss Carryforwards		42	42
Stock Compensation Plan | Southern California Edison
Income Tax Disclosure [Line Items]
Loss Carryforwards		$ 6	$ 6

[1] Deferred tax assets for net operating loss and tax credit carryforwards are reduced by unrecognized tax benefits of $211 million and $100 million for Edison International and SCE, respectively.