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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 2,884 | $ 3,767 | $ 2,777 | $ 2,440 | $ 2,341 | $ 3,763 | $ 2,908 | $ 2,512 | $ 11,869 | $ 11,524 | $ 13,413
Operating income | 566 | 695 | 381 | 448 | 340 | 608 | 524 | 538 | 2,092 | 2,008 | 2,472
Net income |  |  |  |  |  |  |  |  | 1,425 | 1,117 | 1,721
Income (loss) from continuing operations | 347 | 451 | 310 | 305 | (47) | 405 | 406 | 318 | 1,413 | 1,082 | 1,536
Income (loss) from discontinued operations, net | 13 | 0 | (2) | 1 | (8) | 43 | 0 | 0 | 12 | 35 | 185
Net income (loss) attributable to common shareholders | $ 329 | $ 421 | $ 280 | $ 281 | $ (79) | $ 421 | $ 379 | $ 299 | $ 1,311 | $ 1,020 | $ 1,612
Basic earnings per share – continuing operations: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 0.97 | $ 1.29 | $ 0.87 | $ 0.86 | $ (0.22) | $ 1.16 | $ 1.16 | $ 0.92 | $ 3.99 | $ 3.02 | $ 4.38
Discontinued operations (in dollars per share) | 0.04 | 0.00 | (0.01) | 0.00 | (0.02) | 0.13 | 0.00 | 0.00 | 0.03 | 0.11 | 0.57
Total (in dollars per share) | 1.01 | 1.29 | 0.86 | 0.86 | (0.24) | 1.29 | 1.16 | 0.92 | 4.02 | 3.13 | 4.95
Diluted earnings per share – continuing operations: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | 0.96 | 1.27 | 0.86 | 0.85 | (0.22) | 1.15 | 1.15 | 0.91 | 3.94 | 2.99 | 4.33
Diluted earnings (loss) per share – discontinued operations (in dollars per share) | 0.04 | 0.00 | (0.01) | 0.00 | (0.02) | 0.13 | 0.00 | 0.00 | 0.03 | 0.11 | 0.56
Total (in dollars per share) | 1.00 | 1.27 | 0.85 | 0.85 | (0.24) | 1.28 | 1.15 | 0.91 | 3.97 | 3.10 | 4.89
Dividends declared per common share (in dollars per share) | 0.5425 | 0.4800 | 0.4800 | 0.4800 | 0.48 | 0.4175 | 0.4175 | 0.4175 | 1.9825 | 1.7325 | $ 1.4825
Common stock prices: |  |  |  |  |  |  |  |  |  |  |
High (in dollars per share) | 73.81 | 78.72 | 77.71 | 72.34 | 66.29 | 63.18 | 64.55 | 69.59 | 78.72 | 69.59 |
Low (in dollars per share) | 67.44 | 71.31 | 67.71 | 57.97 | 57.51 | 55.52 | 55.18 | 61.02 | 57.97 | 55.18 |
Close (in dollars per share) | $ 71.99 | $ 72.25 | $ 77.67 | $ 71.89 | $ 59.21 | $ 63.07 | $ 55.58 | $ 62.47 | $ 71.99 | $ 59.21 |
Disallowance of Repair Allowance Deduction |  |  |  |  |  |  |  |  |  |  |
Common stock prices: |  |  |  |  |  |  |  |  |  |  |
Income tax charge (benefit) |  |  |  |  |  |  |  |  |  |  | $ (133)
As reported in Form 10-Q filings |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ 449 | $ 306 | $ 295 |  |  |  |  |  |  |
Net income (loss) attributable to common shareholders |  | $ 419 | $ 276 | $ 271 |  |  |  |  |  |  |
Basic earnings per share – continuing operations: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  | $ 1.29 | $ 0.86 | $ 0.83 |  |  |  |  |  |  |
Diluted earnings per share – continuing operations: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  | $ 1.27 | $ 0.85 | $ 0.82 |  |  |  |  |  |  |
SCE |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 2,874 | $ 3,752 | $ 2,768 | $ 2,435 | $ 2,319 | $ 3,757 | $ 2,901 | $ 2,508 | $ 11,830 | $ 11,485 | 13,380
Operating income | 594 | 721 | 429 | 472 | 366 | 626 | 536 | 550 | 2,217 | 2,080 | 2,529
Net income | 359 | 466 | 349 | 325 | (51) | 417 | 412 | 333 | 1,499 | 1,111 | 1,565
Net income (loss) attributable to common shareholders | 328 | 435 | 318 | 295 | (80) | 389 | 384 | 305 | 1,376 | 998 | $ 1,453
Common stock prices: |  |  |  |  |  |  |  |  |  |  |
Common dividends declared | $ 191 | 170 | 170 | 170 | 170 | $ 147 | $ 147 | $ 147 | $ 701 | 611 |
SCE | Disallowance of Repair Allowance Deduction |  |  |  |  |  |  |  |  |  |  |
Common stock prices: |  |  |  |  |  |  |  |  |  |  |
Income tax charge (benefit) |  |  |  |  | $ 382 |  |  |  |  | $ 382 |
SCE | As reported in Form 10-Q filings |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  | 466 | 346 | 317 |  |  |  |  |  |  |
Net income (loss) attributable to common shareholders |  | $ 435 | $ 315 | $ 287 |  |  |  |  |  |  |

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