Consolidated Statements of Changes in Equity (USD $) In Millions, unless otherwise specified		Total	Southern California Edison		Common Stock	Common Stock Southern California Edison	Additional Paid-in Capital Southern California Edison	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Southern California Edison	Retained Earnings	Retained Earnings Southern California Edison	Subtotal	Other Noncontrolling Interests	Other Noncontrolling Interests Southern California Edison	Preferred Stock and Preference Stock	Preferred Stock and Preference Stock Southern California Edison
Balance, at the beginning of the period at Dec. 31, 2009		$ 11,006	$ 8,715		$ 2,304	$ 2,168	$ 551	$ 37	$ (19)	$ 7,500	$ 4,746	$ 9,841	$ 258	$ 349	$ 907	$ 920
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,308	1,092		0	0	0	0	0	1,256	1,092	1,256	0	0	52	0
Other comprehensive income (loss)		(113)	(6)		0	0	0	(113)	(6)	0	0	(113)	0	0	0	0
Deconsolidation of variable interest entities		(249)	(349)		0	0	0	0	0	0	0	0	(249)	(349)	0	0
Cumulative effect of a change in accounting principle, net of tax		15			0			0		15		15	0		0
Common stock dividends declared ($1.3125, $1.285, and $1.265 per share, 2012, 2011 and 2010, respectively)		(412)	(200)		0	0	0	0	0	(412)	(200)	(412)	0	0	0	0
Dividends declared on preferred and preference stock			(52)			0	0		0		(52)			0		0
Dividends, distributions to noncontrolling interests and other		(57)			0			0		0		0	(5)		(52)
Stock-based compensation, net		(16)			8			0		(24)		(16)	0		0
Stock-based compensation and other			(5)			0	4		0		(9)			0		0
Noncash stock-based compensation and other		12	12		19	0	17	0	0	(7)	(5)	12	0	0	0	0
Balance, at the end of the period at Dec. 31, 2010		11,494	9,207		2,331	2,168	572	(76)	(25)	8,328	5,572	10,583	4		907	920
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			236
Balance, at the end of the period at Mar. 31, 2011
Balance, at the beginning of the period at Dec. 31, 2010		11,494	9,207		2,331	2,168	572	(76)	(25)	8,328	5,572	10,583	4		907	920
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		22	1,144		0	0	0	0		(37)	1,144	(37)	0		59
Other comprehensive income (loss)		(63)	1		0	0		(63)	1	0	0	(63)	0	0	0	0
Common stock dividends declared ($1.3125, $1.285, and $1.265 per share, 2012, 2011 and 2010, respectively)		(419)	(461)		0	0	0	0	0	(419)	(461)	(419)	0	0	0	0
Dividends declared on preferred and preference stock			(59)			0	0		0		(59)			0		0
Dividends, distributions to noncontrolling interests and other		(61)			0			0		0		0	(2)		(59)
Stock-based compensation and other		(20)	(10)		14	0	11	0	0	(34)	(21)	(20)	0	0	0	0
Noncash stock-based compensation and other		25	13		30	0	15	0	0	(4)	(2)	26	0	0	(1)	0
Purchase of noncontrolling interest		(15)			(15)			0		0		(15)	0		0
Issuance of preference stock		123	123		0	0	(2)	0	0	0	0	0	0	0	123	125
Balance, at the end of the period at Dec. 31, 2011		11,086	9,958		2,360	2,168	596	(139)	(24)	7,834	6,173	10,055	2	0	1,029	1,045
Balance, at the beginning of the period at Sep. 30, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			262
Balance, at the end of the period at Dec. 31, 2011			9,958
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	[1],[2]		201
Balance, at the end of the period at Mar. 31, 2012
Balance, at the beginning of the period at Dec. 31, 2011		11,086	9,958		2,360	2,168	596	(139)	(24)	7,834	6,173	10,055	2	0	1,029	1,045
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(92)	1,660	[1],[2]	0	0	0	0	0	(183)	1,660	(183)	0	0	91	0
Other comprehensive income (loss)		52	(5)		0	0	0	52	(5)	0	0	52	0	0	0	0
Transfer of assets to Capistrano Wind Partners		(21)			(21)			0		0		(21)	0		0
Common stock dividends declared ($1.3125, $1.285, and $1.265 per share, 2012, 2011 and 2010, respectively)		(428)	(469)		0	0	0	0	0	(428)	(469)	(428)	0	0	0	0
Dividends declared on preferred and preference stock			(91)			0	0		0		(91)			0		0
Dividends, distributions to noncontrolling interests and other		(93)			0			0		0		0	(2)		(91)
Stock-based compensation and other		(80)	(57)		(3)	0	(13)	0	0	(77)	(44)	(80)	0	0	0	0
Noncash stock-based compensation and other		38	18		37	0	18	0	0	1	0	38	0	0	0	0
Issuance of preference stock		804	804		0	0	(21)	0	0	0	0	0	0	0	804	825
Redemption of preference stock		(75)	(75)		0	0	1	0	0	(1)	(1)	(1)	0	0	(74)	(75)
Balance, at the end of the period at Dec. 31, 2012		11,191	11,743		2,373	2,168	581	(87)	(29)	7,146	7,228	9,432	0	0	1,759	1,795
Balance, at the beginning of the period at Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	[1],[2]		858
Balance, at the end of the period at Dec. 31, 2012			$ 11,743

[1] During the fourth quarter of 2012, SCE corrected errors, primarily related to deferred taxes, that resulted in a net earnings benefit of $33 million which were not considered material to the current and prior period consolidated financial statements.

[2] During the fourth quarter of 2012, SCE implemented the 2012 GRC Decision which resulted in an earnings impact of approximately $500 million.