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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
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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.

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