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Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 6 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Southern California Edison | Sep. 30, 2013 Southern California Edison | Jun. 30, 2013 Southern California Edison | Mar. 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Sep. 30, 2012 Southern California Edison | Jun. 30, 2012 Southern California Edison | Mar. 31, 2012 Southern California Edison | Dec. 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Dec. 31, 2011 Southern California Edison | Jun. 30, 2013 San Onofre [Member] Southern California Edison
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 575
Asset impairment net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 365
Earnings benefit from implementation of 2012 GRC Decision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |  |  |  |  |
Immaterial error correction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | 2,943 |  | 3,960 |  | 3,046 |  | 2,632 |  | 3,060 |  | 3,734 |  | 2,653 |  | 2,415 |  | 12,581 |  | 11,862 |  | 10,588 | 2,931 |  | 3,957 |  | 3,045 |  | 2,629 |  | 3,057 |  | 3,731 |  | 2,651 |  | 2,412 |  | 12,562 |  | 11,851 |  | 10,577 |
Operating income | 505 |  | 789 |  | (71) |  | 492 |  | 765 |  | 713 |  | 420 |  | 389 |  | 1,715 |  | 2,285 |  | 2,061 | 505 |  | 804 |  | (55) |  | 498 |  | 792 |  | 659 |  | 430 |  | 397 |  | 1,751 |  | 2,279 |  | 2,123 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,015 |  | (92) |  | 22 | 283 | [1],[2],[3] | 502 | [1],[2],[3] | (67) | [1],[2],[3] | 283 | [1],[2],[3] | 858 | [1],[2] | 388 | [1],[2] | 214 | [1],[2] | 201 | [1],[2] | 1,000 | [1],[2],[3] | 1,660 | [1],[2] | 1,144 |
Income from continuing operations | 289 | [3] | 488 | [3] | (82) | [3] | 286 | [3] | 812 | [1],[2] | 382 | [1],[2] | 207 | [1],[2] | 196 | [1],[2] | 979 | [3] | 1,594 | [1],[2] | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax | 37 |  | (25) |  | 12 |  | 12 |  | (1,326) | [4] | (167) | [4] | (109) | [4] | (84) | [4] | 36 |  | (1,686) | [4] | (1,078) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders | 301 |  | 438 |  | (94) |  | 271 |  | (539) |  | 190 |  | 74 |  | 93 |  | 915 |  | (183) |  | (37) | 258 |  | 477 |  | (91) |  | 256 |  | 833 |  | 363 |  | 191 |  | 182 |  | 900 |  | 1,569 |  | 1,085 |
Basic earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share – continuing operations (in dollars per share) | $ 0.81 |  | $ 1.42 |  | $ (0.33) |  | $ 0.79 |  | $ 2.42 |  | $ 1.09 |  | $ 0.56 |  | $ 0.54 |  | $ 2.70 |  | $ 4.61 |  | $ 3.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share – discontinued operations (in dollars per share) | $ 0.11 |  | $ (0.08) |  | $ 0.04 |  | $ 0.04 |  | $ (4.07) |  | $ (0.51) |  | $ (0.33) |  | $ (0.26) |  | $ 0.11 |  | $ (5.17) |  | $ (3.31) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total basic earnings (loss) per share (in dollars per share) | $ 0.92 |  | $ 1.34 |  | $ (0.29) |  | $ 0.83 |  | $ (1.65) |  | $ 0.58 |  | $ 0.23 |  | $ 0.28 |  | $ 2.81 |  | $ (0.56) |  | $ (0.11) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) per share – continuing operations (in dollars per share) | $ 0.81 |  | $ 1.41 |  | $ (0.33) |  | $ 0.78 |  | $ 2.39 |  | $ 1.09 |  | $ 0.55 |  | $ 0.54 |  | $ 2.67 |  | $ 4.55 |  | $ 3.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) per share – discontinued operations (in dollars per share) | $ 0.11 |  | $ (0.07) |  | $ 0.04 |  | $ 0.04 |  | $ (4.03) |  | $ (0.51) |  | $ (0.33) |  | $ (0.26) |  | $ 0.11 |  | $ (5.11) |  | $ (3.28) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total diluted earnings (loss) per share (in dollars per share) | $ 0.92 |  | $ 1.34 |  | $ (0.29) |  | $ 0.82 |  | $ (1.64) |  | $ 0.58 |  | $ 0.22 |  | $ 0.28 |  | $ 2.78 |  | $ (0.56) |  | $ (0.11) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 0.3550 |  | $ 0.3375 |  | $ 0.3375 |  | $ 0.3375 |  | $ 0.3375 |  | $ 0.325 |  | $ 0.325 |  | $ 0.325 |  | $ 1.3675 |  | $ 1.3125 |  | $ 1.285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 126 |  | $ 120 |  | $ 120 |  | $ 120 |  | $ 120 |  | $ 116 |  | $ 116 |  | $ 116 |  | $ 486 |  | $ 469 |  |  |
Common stock prices: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High | $ 49.95 |  | $ 50.34 |  | $ 54.19 |  | $ 51.24 |  | $ 47.96 |  | $ 46.94 |  | $ 46.55 |  | $ 44.50 |  | $ 54.19 |  | $ 47.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Low | $ 44.97 |  | $ 44.26 |  | $ 44.86 |  | $ 44.92 |  | $ 42.57 |  | $ 43.10 |  | $ 41.42 |  | $ 39.60 |  | $ 44.26 |  | $ 39.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Close | $ 46.30 |  | $ 46.06 |  | $ 48.16 |  | $ 50.32 |  | $ 45.19 |  | $ 45.69 |  | $ 46.20 |  | $ 42.51 |  | $ 46.30 |  | $ 45.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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.
[3] | During the second quarter of 2013, SCE recorded an impairment charge of $575 million ($365 million after tax) related to the permanent retirement of San Onofre Units 2 and 3.
[4] | During the fourth quarter of 2012, Edison International recorded a full impairment of its investment in EME. See Note 16 for further information.

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