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Quarterly Financial Data (Unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 24 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 2,341,000,000 |  | $ 3,763,000,000 |  | $ 2,908,000,000 |  | $ 2,512,000,000 |  | $ 3,114,000,000 |  | $ 4,356,000,000 |  | $ 3,016,000,000 |  | $ 2,926,000,000 |  |  | $ 11,524,000,000 |  | $ 13,413,000,000 |  | $ 12,581,000,000 |
Operating income | 340,000,000 |  | 608,000,000 |  | 524,000,000 |  | 538,000,000 |  | 693,000,000 |  | 874,000,000 |  | 575,000,000 |  | 331,000,000 |  |  | 2,008,000,000 |  | 2,472,000,000 |  | 1,715,000,000 |
Income from continuing operations | (47,000,000) | [1] | 405,000,000 | [1] | 406,000,000 | [1] | 318,000,000 | [1] | 406,000,000 | [2] | 524,000,000 | [2] | 382,000,000 | [2] | 224,000,000 | [2] |  | 1,082,000,000 | [1] | 1,536,000,000 | [2] | 979,000,000 |
Income (loss) from discontinued operations, net | (8,000,000) |  | 43,000,000 |  | 0 |  | 0 |  | 39,000,000 |  | (16,000,000) |  | 184,000,000 |  | (22,000,000) |  |  | 35,000,000 |  | 185,000,000 |  | 36,000,000 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,117,000,000 |  | 1,721,000,000 |  | 1,015,000,000 |
Net income (loss) attributable to common shareholders | $ (79,000,000) |  | $ 421,000,000 |  | $ 379,000,000 |  | $ 299,000,000 |  | $ 420,000,000 |  | $ 480,000,000 |  | $ 536,000,000 |  | $ 176,000,000 |  |  | $ 1,020,000,000 |  | $ 1,612,000,000 |  | $ 915,000,000 |
Basic earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share – continuing operations (in dollars per share) | $ (0.22) |  | $ 1.16 |  | $ 1.16 |  | $ 0.92 |  | $ 1.17 |  | $ 1.52 |  | $ 1.08 |  | $ 0.61 |  |  | $ 3.02 |  | $ 4.38 |  | $ 2.70 |
Basic earnings (loss) per share – discontinued operations (in dollars per share) | (0.02) |  | 0.13 |  | 0.00 |  | 0.00 |  | 0.12 |  | (0.05) |  | 0.56 |  | (0.07) |  |  | 0.11 |  | 0.57 |  | 0.11 |
Total (in dollars per share) | (0.24) |  | 1.29 |  | 1.16 |  | 0.92 |  | 1.29 |  | 1.47 |  | 1.64 |  | 0.54 |  |  | 3.13 |  | 4.95 |  | 2.81 |
Diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) per share – continuing operations (in dollars per share) | (0.22) |  | 1.15 |  | 1.15 |  | 0.91 |  | 1.15 |  | 1.51 |  | 1.07 |  | 0.61 |  |  | 2.99 |  | 4.33 |  | 2.67 |
Diluted earnings (loss) per share – discontinued operations (in dollars per share) | (0.02) |  | 0.13 |  | 0.00 |  | 0.00 |  | 0.12 |  | (0.05) |  | 0.56 |  | (0.07) |  |  | 0.11 |  | 0.56 |  | 0.11 |
Total (in dollars per share) | (0.24) |  | 1.28 |  | 1.15 |  | 0.91 |  | 1.27 |  | 1.46 |  | 1.63 |  | 0.54 |  |  | 3.10 |  | 4.89 |  | 2.78 |
Dividends declared per share (in dollars per share) | 0.48 |  | 0.4175 |  | 0.4175 |  | 0.4175 |  | 0.4175 |  | 0.3550 |  | 0.3550 |  | 0.3550 |  |  | 1.7325 |  | 1.4825 |  | $ 1.3675 |
Common stock prices: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High (in dollars per share) | 66.29 |  | 63.18 |  | 64.55 |  | 69.59 |  | 68.74 |  | 59.54 |  | 58.24 |  | 56.61 |  |  | 69.59 |  | 68.74 |  |  |
Low (in dollars per share) | 57.51 |  | 55.52 |  | 55.18 |  | 61.02 |  | 55.88 |  | 54.12 |  | 53.63 |  | 44.74 |  |  | 55.18 |  | 44.74 |  |  |
Close (in dollars per share) | $ 59.21 |  | $ 63.07 |  | $ 55.58 |  | $ 62.47 |  | $ 65.48 |  | $ 55.92 |  | $ 58.11 |  | $ 56.61 |  |  | $ 59.21 |  | $ 65.48 |  |  | $ 65.48
Impairment and other charges | $ 382,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  | $ 157,000,000 |  | $ 571,000,000 |
Southern California Edison |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | 2,319,000,000 |  | $ 3,757,000,000 |  | $ 2,901,000,000 |  | $ 2,508,000,000 |  | $ 3,104,000,000 |  | $ 4,338,000,000 |  | $ 3,014,000,000 |  | $ 2,924,000,000 |  |  | 11,485,000,000 |  | 13,380,000,000 |  | 12,562,000,000 |
Operating income | 366,000,000 |  | 626,000,000 |  | 536,000,000 |  | 550,000,000 |  | 715,000,000 |  | 881,000,000 |  | 593,000,000 |  | 342,000,000 |  |  | 2,080,000,000 |  | 2,529,000,000 |  | 1,751,000,000 |
Net income | (51,000,000) | [3] | 417,000,000 | [3] | 412,000,000 | [3] | 333,000,000 | [3] | 408,000,000 | [4] | 531,000,000 | [4] | 392,000,000 | [4] | 234,000,000 | [4] |  | 1,111,000,000 | [3] | 1,565,000,000 | [4] | 1,000,000,000 |
Net income (loss) attributable to common shareholders | (80,000,000) |  | 389,000,000 |  | 384,000,000 |  | 305,000,000 |  | 380,000,000 |  | 503,000,000 |  | 362,000,000 |  | 208,000,000 |  |  | 998,000,000 |  | 1,453,000,000 |  | 900,000,000 |
Common stock prices: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common dividends declared | $ 170,000,000 |  | $ 147,000,000 |  | $ 147,000,000 |  | $ 147,000,000 |  | 147,000,000 |  | $ 126,000,000 |  | 126,000,000 |  | $ 126,000,000 |  |  | 611,000,000 |  | 525,000,000 |  |  |
Impairment and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 163,000,000 |  | $ 575,000,000 |
San Onofre | Southern California Edison |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock prices: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment and other charges |  |  |  |  |  |  |  |  | 68,000,000 |  |  |  | 231,000,000 |  |  |  | $ 575,000,000 |  |  | 163,000,000 |  |  | $ 738,000,000
Asset impairment net of tax |  |  |  |  |  |  |  |  | $ 24,000,000 |  |  |  | $ 96,000,000 |  |  |  | $ 365,000,000 |  |  | $ 72,000,000 |  |  | $ 437,000,000
[1] | In the fourth quarter of 2015, as result of the 2015 GRC Decision, SCE recorded a $382 million write-down of regulatory assets previously recorded for recovery of deferred income taxes from 2012 – 2014 incremental tax repair deductions. 2014(in millions, except per-share amounts)Total Fourth Third Second FirstOperating revenue$13,413 $3,114 $4,356 $3,016 $2,926Operating income 2,472 693 874 575 331Income from continuing operations11,536 406 524 382 224Income (loss) from discontinued operations, net185 39 (16) 184 (22)Net income attributable to common shareholders1,612 420 480 536 176Basic earnings (loss) per share: Continuing operations$4.38 $1.17 $1.52 $1.08 $0.61 Discontinued operations0.57 0.12 (0.05) 0.56 (0.07)Total$4.95 $1.29 $1.47 $1.64 $0.54Diluted earnings (loss) per share: Continuing operations$4.33 $1.15 $1.51 $1.07 $0.61 Discontinued operations0.56 0.12 (0.05) 0.56 (0.07)Total$4.89 $1.27 $1.46 $1.63 $0.54Dividends declared per share1.4825 0.4175 0.3550 0.3550 0.3550Common stock prices: High68.74 68.74 59.54 58.24 56.61Low44.74 55.88 54.12 53.63 44.74Close65.48 65.48 55.92 58.11 56.61
[2] | During the first quarter of 2014, SCE recorded an impairment charge of $231 million ($96 million after-tax) in 2014. During the fourth quarter of 2014, SCE reduced its estimated impact of the San Onofre OII Settlement by $68 million ($24 million after-tax) consistent with the advice for reimbursement of recorded costs.
[3] | In the fourth quarter of 2015, as result of the 2015 GRC Decision, SCE recorded a $382 million write-down of regulatory assets previously recorded for recovery of deferred income taxes from 2012 – 2014 incremental tax repair deductions. 2014(in millions)Total Fourth Third Second FirstOperating revenue$13,380 $3,104 $4,338 $3,014 $2,924Operating income2,529 715 881 593 342Net income11,565 408 531 392 234Net income available for common stock1,453 380 503 362 208Common dividends declared525 147 126 126 126
[4] | During the first quarter of 2014, SCE recorded an impairment charge of $231 million ($96 million after-tax) in 2014. During the fourth quarter of 2014, SCE reduced its estimated impact of the San Onofre OII Settlement by $68 million ($24 million after-tax) consistent with the advice for reimbursement of recorded costs.

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