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Summary of Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Data [Line Items]                      
Revenues $ 3,442 $ 3,714 $ 3,309 $ 3,552 $ 3,375 $ 3,917 $ 3,401 $ 3,869 $ 14,017 [1] $ 14,562 [1] $ 15,026 [1]
Other operating expenses 1,195 940 956 1,141 1,021 950 963 917 4,232 3,851 3,740
Pension and OPEB mark-to-market adjustment 141 0 0 0 147 0 0 0 141 147 242
Provision for depreciation 293 289 281 275 339 311 334 329 1,138 1,313 1,282
Impairment of assets and related charges 2,244 31 131 0 9,218 0 1,447 0 2,406 10,665 42
Operating Income (Loss) (1,830) 884 544 574 (8,924) 861 (975) 776 172 (8,262) 2,292
Income (loss) before income taxes (benefits) (2,086) 635 291 331 (9,185) 631 (1,219) 541      
Income taxes (benefits) 413 239 117 126 (3,389) 251 (130) 213 895 (3,055) 315
Net income (loss) $ (2,499) $ 396 $ 174 $ 205 $ (5,796) $ 380 $ (1,089) $ 328 $ (1,724) $ (6,177) $ 578
Earnings (loss) per share of common stock-                      
Basic earnings (loss) per share of common stock, in dollars per share $ (5.62) $ 0.89 $ 0.39 $ 0.46 $ (13.44) $ 0.89 $ (2.56) $ 0.78 $ (3.88) $ (14.49) $ 1.37
Diluted earnings (loss) per share of common stock, in dollars per share $ (5.62) $ 0.89 $ 0.39 $ 0.46 $ (13.44) $ 0.89 $ (2.56) $ 0.77 $ (3.88) $ (14.49) $ 1.37
FES                      
Quarterly Financial Data [Line Items]                      
Revenues $ 700 $ 743 $ 741 $ 914 $ 997 $ 1,100 $ 1,102 $ 1,199 $ 3,098 [2] $ 4,398 [2] $ 5,005 [2]
Other operating expenses 419 291 286 518 352 316 369 240 1,514 1,277 1,308
Pension and OPEB mark-to-market adjustment 24 0 0 0 48 0 0 0 24 48 57
Provision for depreciation 29 28 27 25 86 83 84 83 109 336 324
Impairment of assets and related charges 2,031 0 0 0 8,082 0 540 0 2,031 8,622 33
Operating Income (Loss) (2,112) 102 61 (117) (8,153) 101 (571) 226 (2,066) (8,397) 277
Income (loss) before income taxes (benefits) (2,125) 108 42 (121) (8,171) 96 (581) 213      
Income taxes (benefits) 281 32 23 (41) (2,983) 56 (143) 82 295 (2,988) 65
Net income (loss) $ (2,406) $ 76 $ 19 $ (80) $ (5,188) $ 40 $ (438) $ 131 $ (2,391) $ (5,455) $ 82
[1] Includes excise tax collections of $390 million, $406 million and $416 million in 2017, 2016 and 2015, respectively.
[2] Includes excise tax collections of $20 million, $28 million and $44 million in 2017, 2016 and 2015, respectively.