Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Accounting Policies [Abstract]

Inventory Components

Inventory consisted of the following:

(in millions)	September 30, 2012		December 31, 2011
Coal, gas, fuel oil and other raw materials	$	138	$	143
Spare parts, materials and supplies	370		376
Total inventory	$	508	$	519

EPS Computation

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

	Three months ended September 30,				Nine months ended September 30,
(in millions)	2012		2011		2012		2011
Basic earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders, net of tax	$	266	$	411	$	486	$	805
Participating securities dividends	—		—		—		—
Income from continuing operations available to common shareholders	$	266	$	411	$	486	$	805
Weighted average common shares outstanding	326		326		326		326
Basic earnings per share – continuing operations	$	0.81	$	1.26	$	1.49	$	2.47
Diluted earnings per share – continuing operations:
Income from continuing operations available to common shareholders	$	266	$	411	$	486	$	805
Income impact of assumed conversions	—		2		1		3
Income from continuing operations available to common shareholders and assumed conversions	$	266	$	413	$	487	$	808
Weighted average common shares outstanding	326		326		326		326
Incremental shares from assumed conversions	3		3		2		3
Adjusted weighted average shares – diluted	329		329		328		329
Diluted earnings per share – continuing operations	$	0.81	$	1.25	$	1.48	$	2.46