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Quarterly Data (Unaudited) - Quarterly Operating Results (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 8,814 | $ 9,403 | $ 8,076 | $ 9,693 | $ 8,384 | $ 8,768 | $ 7,665 | $ 8,747 | $ 35,985 | $ 33,565 | $ 31,366
Operating income (loss) | 708 | 1,146 | 942 | 1,101 | 1,288 | 1,499 | 300 | 1,308 | 3,898 | 4,395 | 3,212
Net income attributable to common shareholders | 152 | 733 | 539 | 585 | 1,880 | 823 | 95 | 990 | 2,010 | 3,786 | 1,121
Net income (loss) |  |  |  |  |  |  |  |  | 2,084 | 3,876 | 1,196
Exelon Generation Co L L C [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 5,069 | 5,278 | 4,579 | 5,512 | 4,657 | 4,750 | 4,216 | 4,878 | 20,437 | 18,500 | 17,757
Operating income (loss) | 35 | 311 | 282 | 347 | 504 | 497 | (427) | 373 | 975 | 947 | 820
Net income (loss) attributable to membership interest | (178) | 234 | 178 | 136 | 2,224 | 304 | (235) | 418 | 370 | 2,710 | 483
Net income (loss) |  |  |  |  |  |  |  |  | 443 | 2,798 | 550
Commonwealth Edison Co [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 1,373 | 1,598 | 1,398 | 1,512 | 1,309 | 1,571 | 1,357 | 1,298 | 5,882 | 5,536 | 5,254
Operating income (loss) | 242 | 323 | 288 | 292 | 286 | 404 | 319 | 314 | 1,146 | 1,323 | 1,205
Net income (loss) | 141 | 193 | 164 | 165 | 120 | 189 | 118 | 141 | 664 | 567 | 378
PECO Energy Co [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 765 | 757 | 653 | 866 | 729 | 715 | 630 | 796 | 3,038 | 2,870 | 2,994
Operating income (loss) | 165 | 154 | 127 | 142 | 157 | 169 | 137 | 192 | 587 | 655 | 702
Net income (loss) | 124 | 126 | 96 | 113 | 107 | 112 | 88 | 127 | 460 | 434 | 438
Baltimore Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 799 | 731 | 662 | 977 | 813 | 738 | 674 | 951 | 3,169 | 3,176 | 3,233
Operating income (loss) | 109 | 103 | 85 | 177 | 163 | 124 | 98 | 228 | 474 | 614 | 550
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 313 | 307 | 286
Net income (loss) | 71 | 63 | 51 | 128 | 76 | 62 | 45 | 125 | 313 | 307 | 294
Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 1,117 | 1,361 | 1,076 | 1,251 | 1,121 | 1,310 | 1,074 | 1,175 | 4,805 | 4,679 |
Operating income (loss) | 126 | 245 | 153 | 126 | 159 | 285 | 148 | 180 | 650 | 769 |
Net income (loss) attributable to membership interest | 62 | 187 | 84 | 65 | 4 | 153 | 66 | 140 | 398 | 362 |
Net income (loss) |  |  |  |  |  |  |  |  | 398 | 362 |
Potomac Electric Power Company [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 531 | 628 | 523 | 557 | 510 | 604 | 514 | 530 | 2,239 | 2,158 | 2,186
Operating income (loss) | 65 | 112 | 85 | 56 | 87 | 149 | 84 | 79 | 320 | 399 | 174
Net income (loss) | 36 | 89 | 54 | 31 | 17 | 87 | 43 | 58 | 210 | 205 | 42
Delmarva Power & Light Company [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 331 | 328 | 289 | 384 | 330 | 327 | 282 | 362 | 1,332 | 1,300 | 1,277
Operating income (loss) | 48 | 51 | 42 | 49 | 52 | 59 | 41 | 78 | 190 | 229 | 50
Net income (loss) | 30 | 33 | 26 | 31 | 14 | 31 | 19 | 57 | 120 | 121 | (9)
Atlantic City Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 254 | 406 | 265 | 310 | 271 | 370 | 270 | 275 | 1,236 | 1,186 | 1,257
Operating income (loss) | 14 | 84 | 25 | 23 | 28 | 79 | 25 | 25 | 149 | 157 | 7
Net income (loss) | $ (1) | $ 61 | $ 8 | $ 7 | $ 0 | $ 41 | $ 8 | $ 28 | $ 75 | $ 77 | $ (42)

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