Income Taxes (Tax Rate Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Effective Tax Rate
Income from continuing operations before income taxes	$ 1,861		$ 1,668		$ 1,479
Provision for income tax at federal statutory rate of 35%	652		584		518
Repair deductions	(231)	[1]	0	[1]	0	[1]
Global Settlement related	0	[2]	0	[2]	(159)	[2]
Change in tax accounting method for asset removal costs	0	[3]	0	[3]	(40)	[3]
State tax, net of federal benefit	108		85		44
Health care legislation	0	[4]	0	[4]	39	[4]
Property-related	(223)	[5]	(46)	[5]	(92)	[5]
Accumulated deferred income tax adjustments	(41)		(30)		0
Tax reserve	40		0		44
Other	(38)		(25)		(19)
Total income tax expense from continuing operations	267		568		335
Earnings benefit from change in prior year tax deductions	231
Total income tax expense from continuing operations	14.30%		34.10%		22.70%
Change in tax accounting method for asset removal costs in prior periods					28
Southern California Edison
Effective Tax Rate
Income from continuing operations before income taxes	1,874		1,745		1,532
Provision for income tax at federal statutory rate of 35%	656		611		536
Repair deductions	(231)	[1]	0	[1]	0	[1]
Global Settlement related	0	[2]	0	[2]	(95)	[2]
Change in tax accounting method for asset removal costs	0	[3]	0	[3]	(40)	[3]
State tax, net of federal benefit	54		80		59
Health care legislation	0	[4]	0	[4]	39	[4]
Property-related	(223)	[5]	(46)	[5]	(92)	[5]
Accumulated deferred income tax adjustments	(41)		(30)		0
Tax reserve	36		(3)		45
Other	(37)		(11)		(12)
Total income tax expense from continuing operations	$ 214		$ 601		$ 440
Total income tax expense from continuing operations	11.40%		34.40%		28.70%

[1] As discussed below, SCE recorded a $231 million earnings benefit in the fourth quarter of 2012, resulting from the flow-through regulatory treatment for certain repair costs for 2009 – 2011 as adopted in the 2012 GRC.

[2] During 2010, Edison International and SCE recognized an earnings benefit of $159 million and $95 million, respectively, from the acceptance by the California Franchise Tax Board of the IRS tax positions finalized in 2009 and receipt of the final interest determination from the Franchise Tax Board.

[3] During the second quarter of 2010, the IRS approved Edison International's request to change its tax accounting method for asset removal costs primarily related to SCE's infrastructure replacement program. As a result, Edison International and SCE recognized a $40 million earnings benefit (of which $28 million relates to asset removal costs incurred prior to 2010) from deducting asset removal costs earlier in the construction cycle. These deductions were recorded on a flow-through basis as required by the CPUC.

[4] During the first quarter of 2010, Edison International and SCE recorded a $39 million non-cash charge to reverse previously recognized federal tax benefits eliminated by the federal health care legislation enacted in March 2010. The health care law eliminated the federal tax deduction for retiree health care costs to the extent those costs are eligible for federal Medicare Part D subsidies.

[5] Incremental repair benefit recorded in 2012. See discussion of repair deductions below.