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Consolidated Statements of Changes in Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | $ 11,191 | $ 11,086
Net income | 298 | 112
Other comprehensive income (loss) | 0 | 21
Contributions from noncontrolling interests |  | 238
Transfer of assets to Capistrano Wind Partners |  | (50)
Common stock dividends declared | (110) | (106)
Dividends, distributions to noncontrolling interests and other | (27) | (16)
Stock-based compensation and other | (32) | (28)
Noncash stock-based compensation and other | 2 | 5
Issuance of preference stock | 387 | 345
Redemption of preference stock | (400) |
Balance, at the end of the period | 11,309 | 11,607
Dividends declared per common share (in dollars per share) | $ 0.3375 | $ 0.325
Common Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 2,373 | 2,360
Net income | 0 | 0
Other comprehensive income (loss) |  | 0
Contributions from noncontrolling interests |  | 0
Transfer of assets to Capistrano Wind Partners |  | (50)
Common stock dividends declared | 0 | 0
Dividends, distributions to noncontrolling interests and other | 0 | 0
Stock-based compensation and other | 1 | 8
Noncash stock-based compensation and other | 6 | 7
Issuance of preference stock | 0 | 0
Redemption of preference stock | 0 |
Balance, at the end of the period | 2,380 | 2,325
Accumulated Other Comprehensive Income (Loss) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | (87) | (139)
Net income | 0 | 0
Other comprehensive income (loss) |  | 21
Contributions from noncontrolling interests |  | 0
Transfer of assets to Capistrano Wind Partners |  | 0
Common stock dividends declared | 0 | 0
Dividends, distributions to noncontrolling interests and other | 0 | 0
Stock-based compensation and other | 0 | 0
Noncash stock-based compensation and other | 0 | 0
Issuance of preference stock | 0 | 0
Redemption of preference stock | 0 |
Balance, at the end of the period | (87) | (118)
Retained Earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 7,146 | 7,834
Net income | 271 | 93
Other comprehensive income (loss) |  | 0
Contributions from noncontrolling interests |  | 0
Transfer of assets to Capistrano Wind Partners |  | 0
Common stock dividends declared | (110) | (106)
Dividends, distributions to noncontrolling interests and other | 0 | 0
Stock-based compensation and other | (33) | (36)
Noncash stock-based compensation and other | (4) | (2)
Issuance of preference stock | 0 | 0
Redemption of preference stock | (8) |
Balance, at the end of the period | 7,262 | 7,783
Subtotal |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 9,432 | 10,055
Net income | 271 | 93
Other comprehensive income (loss) |  | 21
Contributions from noncontrolling interests |  | 0
Transfer of assets to Capistrano Wind Partners |  | (50)
Common stock dividends declared | (110) | (106)
Dividends, distributions to noncontrolling interests and other | 0 | 0
Stock-based compensation and other | (32) | (28)
Noncash stock-based compensation and other | 2 | 5
Issuance of preference stock | 0 | 0
Redemption of preference stock | (8) |
Balance, at the end of the period | 9,555 | 9,990
Other Noncontrolling Interests |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period |  | 2
Net income |  | 0
Other comprehensive income (loss) |  | 0
Contributions from noncontrolling interests |  | 238
Transfer of assets to Capistrano Wind Partners |  | 0
Common stock dividends declared |  | 0
Dividends, distributions to noncontrolling interests and other |  | 3
Stock-based compensation and other |  | 0
Noncash stock-based compensation and other |  | 0
Issuance of preference stock |  | 0
Balance, at the end of the period |  | 243
Preferred Stock and Preference Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 1,759 | 1,029
Net income | 27 | 19
Other comprehensive income (loss) |  | 0
Contributions from noncontrolling interests |  | 0
Transfer of assets to Capistrano Wind Partners |  | 0
Common stock dividends declared | 0 | 0
Dividends, distributions to noncontrolling interests and other | (27) | (19)
Stock-based compensation and other | 0 | 0
Noncash stock-based compensation and other | 0 | 0
Issuance of preference stock | 387 | 345
Redemption of preference stock | (392) |
Balance, at the end of the period | 1,754 | 1,374
Southern California Edison |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 11,743 | 9,958
Net income | 283 | 201
Other comprehensive income (loss) | (3) | 3
Common stock dividends declared | (120) | (116)
Dividends declared on preferred and preference stock | (27) | (19)
Stock-based compensation and other | (29) | (15)
Noncash stock-based compensation and other | 8 | 6
Issuance of preference stock | 387 | 345
Redemption of preference stock | (400) |
Balance, at the end of the period | 11,842 | 10,363
Southern California Edison | Common Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 2,168 | 2,168
Net income | 0 | 0
Other comprehensive income (loss) | 0 | 0
Common stock dividends declared | 0 | 0
Dividends declared on preferred and preference stock | 0 | 0
Stock-based compensation and other | 0 | 0
Noncash stock-based compensation and other | 0 | 0
Issuance of preference stock | 0 | 0
Redemption of preference stock | 0 |
Balance, at the end of the period | 2,168 | 2,168
Southern California Edison | Additional Paid-in Capital |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 581 | 596
Net income | 0 | 0
Other comprehensive income (loss) | 0 | 0
Common stock dividends declared | 0 | 0
Dividends declared on preferred and preference stock | 0 | 0
Stock-based compensation and other | 0 | 6
Noncash stock-based compensation and other | 3 | 3
Issuance of preference stock | (13) | (5)
Redemption of preference stock | 8 |
Balance, at the end of the period | 579 | 600
Southern California Edison | Accumulated Other Comprehensive Income (Loss) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | (29) | (24)
Net income | 0 | 0
Other comprehensive income (loss) | (3) | 3
Common stock dividends declared | 0 | 0
Dividends declared on preferred and preference stock | 0 | 0
Stock-based compensation and other | 0 | 0
Noncash stock-based compensation and other | 0 | 0
Issuance of preference stock | 0 | 0
Redemption of preference stock | 0 |
Balance, at the end of the period | (32) | (21)
Southern California Edison | Retained Earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 7,228 | 6,173
Net income | 283 | 201
Other comprehensive income (loss) | 0 | 0
Common stock dividends declared | (120) | (116)
Dividends declared on preferred and preference stock | (27) | (19)
Stock-based compensation and other | (29) | (21)
Noncash stock-based compensation and other | 5 | 3
Issuance of preference stock | 0 | 0
Redemption of preference stock | (8) |
Balance, at the end of the period | 7,332 | 6,221
Southern California Edison | Preferred Stock and Preference Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 1,795 | 1,045
Net income | 0 | 0
Other comprehensive income (loss) | 0 | 0
Common stock dividends declared | 0 | 0
Dividends declared on preferred and preference stock | 0 | 0
Stock-based compensation and other | 0 | 0
Noncash stock-based compensation and other | 0 | 0
Issuance of preference stock | 400 | 350
Redemption of preference stock | (400) |
Balance, at the end of the period | $ 1,795 | $ 1,395

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