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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 3,157 | $ 4,644 | $ 2,987 | $ 2,790 | $ 2,970 | $ 3,741 | $ 2,812 | $ 2,824 | $ 13,578 | $ 12,347 | $ 12,657
Operating income (loss) | 794 | (379) | 500 | 302 | 287 | 636 | 500 | 352 | 1,217 | 1,775 | (552)
Net income (loss) | 552 | (242) | 348 | 213 | 173 | 502 | 422 | 308 | $ 871 | $ 1,405 | $ (316)
Net income attributable to common shareholders | $ 526 | $ (288) | $ 318 | $ 183 | $ 143 | $ 471 | $ 392 | $ 278 |  |  |
Basic earnings (loss) per share (in dollars per share) | $ 1.39 | $ (0.76) | $ 0.85 | $ 0.50 | $ 0.40 | $ 1.36 | $ 1.20 | $ 0.85 | $ 1.98 | $ 3.78 | $ (1.30)
Diluted earnings (loss) per share (in dollars per share) | 1.39 | (0.76) | 0.85 | 0.50 | 0.40 | 1.35 | 1.20 | 0.85 | 1.98 | 3.77 | (1.30)
Dividends declared per common share (in dollars per share) | $ 0.6625 | $ 0.6375 | $ 0.6375 | $ 0.6375 | $ 0.6375 | $ 0.6125 | $ 0.6125 | $ 0.6125 | $ 2.5750 | $ 2.4750 | $ 2.4275
SCE |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 3,151 | $ 4,635 | $ 2,980 | $ 2,780 | $ 2,958 | $ 3,732 | $ 2,800 | $ 2,816 | $ 13,546 | $ 12,306 | $ 12,611
Operating income (loss) | 678 | (364) | 548 | 316 | 325 | 649 | 513 | 358 | 1,178 | 1,845 | (406)
Net income (loss) | 500 | (218) | 411 | 249 | 224 | 534 | 449 | 323 | 942 | 1,530 | (189)
Net income attributable to common shareholders | 474 | (264) | 381 | 219 | 194 | 503 | 419 | 293 | $ 810 | $ 1,409 | $ (310)
Dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.6030 | $ 1.3797 | $ 1.3245
Common dividends declared | $ 325 | $ 269 | $ 269 | $ 269 | $ 200 | $ 200 | $ 0 | $ 200 |  |  |

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