Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Cash Equivalents

Checks issued, but not yet paid by the financial institution, are reclassified from cash to accounts payable at the end of each reporting period as follows:

	Edison International				SCE
	December 31,
(in millions)	2012		2011		2012		2011
Cash reclassified to accounts payable	$	247	$	220	$	242	$	220

The cash equivalents were as follows:

	Edison International				SCE
	December 31,
(in millions)	2012		2011		2012		2011
Money market funds	$	107	$	114	$	5	$	21

Inventory Components

Inventory consisted of the following:

	December 31,
(in millions)	2012		2011
Materials, supplies and spare parts	$	319	$	326
Fuel	21		24
Total inventory	$	340	$	350

Estimated Useful Lives (Authorized by the CPUC) and Weighted-Average Useful Lives of Property, Plant and Equipment

Estimated useful lives (authorized by the CPUC) and weighted-average useful lives of SCE's property, plant and equipment, are as follows:

	Estimated Useful Lives	Weighted-Average Useful Lives
Generation plant	12 years to 70 years	38 years
Distribution plant	30 years to 60 years	37 years
Transmission plant	35 years to 65 years	46 years
General and Other plant	5 years to 60 years	23 years

Reconciliation of the Changes in ARO Liability

A reconciliation of the changes in SCE's ARO liability is as follows:

	December 31,
(in millions)	2012			2011
Beginning balance	$	2,610		$	2,507
Accretion expense	161			62
Revisions	12			42
Liabilities settled	(1		)	(1		)
Ending balance	$	2,782		$	2,610

Amortization of deferred financing costs

Amortization of deferred financing costs charged to interest expense is as follows:

	Edison International						SCE
	December 31,
(in millions)	2012		2011		2010		2012		2011		2010
Amortization of deferred financing costs charged to interest expense	$	30	$	34	$	30	$	29	$	33	$	30

EPS Attributable to Edison International Common Shareholders

EPS attributable to Edison International common shareholders was computed as follows:

	Years ended December 31,
(in millions)	2012			2011			2010
Basic earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders, net of tax	$	1,503		$	1,041		$	1,092
Participating securities dividends	—			—			(5		)
Income from continuing operations available to common shareholders	$	1,503		$	1,041		$	1,087
Weighted average common shares outstanding	326			326			326
Basic earnings per share – continuing operations	$	4.61		$	3.20		$	3.34
Diluted earnings per share – continuing operations:
Income from continuing operations available to common shareholders	$	1,503		$	1,041		$	1,087
Income impact of assumed conversions	(1		)	(1		)	5
Income from continuing operations available to common shareholders and assumed conversions	$	1,502		$	1,040		$	1,092
Weighted average common shares outstanding	326			326			326
Incremental shares from assumed conversions	4			3			3
Adjusted weighted average shares – diluted	330			329			329
Diluted earnings per share – continuing operations	$	4.55		$	3.17		$	3.32