Income Taxes (Operating Loss and Tax Carryforward) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits		$ 529	$ 576	$ 815	$ 812
Loss Carryforwards, Expiring 2021 to 2034		1,136
Loss Carryforwards, No expiration date		0
Loss Carryforwards	[1]	1,136
Credit Carryforward, Expiring 2021 to 2034		409
Credit Carryforward, No expiration date		54
Credit Carryforwards	[1]	463
Loss and credit carryforwards		1,388	1,657	2,200
Southern California Edison
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits		353	441	$ 532	$ 571
Loss Carryforwards, Expiring 2021 to 2034		39
Loss Carryforwards	[1]	39
Credit Carryforward, Expiring 2021 to 2034		22
Credit Carryforward, No expiration date		39
Credit Carryforwards	[1]	61
Loss and credit carryforwards		0	$ 205
Capistrano Wind [Member]
Tax Credit Carryforward [Line Items]
Loss and credit carryforwards		210
Loss And Credit Carryforwards [Member]
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits		211
Loss And Credit Carryforwards [Member] | Southern California Edison
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits		$ 100

[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.