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Summary of Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 13, 2016
Dec. 31, 2016
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]                          
REVENUES     $ 3,375 $ 3,917 $ 3,401 $ 3,869 $ 3,541 $ 4,123 $ 3,465 $ 3,897 $ 14,562 [1] $ 15,026 [1] $ 15,049 [1]
Other operating expenses     1,023 953 964 918 950 842 900 1,057 3,858 3,749 3,962
Pension and OPEB mark-to-market adjustment     147 0 0 0 242 0 0 0 147 242 835
Provision for depreciation     339 311 334 329 313 328 322 319 1,313 1,282 1,220
Impairment of assets     9,218 0 1,447 0 18 8 16 0 10,665 42 0
Operating Income (Loss)     (8,924) 861 (975) 776 236 908 554 594 (8,262) 2,292 1,062
Income (loss) before income taxes (benefits)     (9,185) 631 (1,219) 541 (396) 621 302 366      
Income taxes (benefits)     (3,389) 251 (130) 213 (170) 226 115 144 (3,055) 315 (42)
NET INCOME (LOSS)     $ (5,796) $ 380 $ (1,089) $ 328 $ (226) $ 395 $ 187 $ 222 $ (6,177) $ 578 $ 299
Earnings (loss) per share of common stock-                          
Basic - Earnings (losses) Available to FirstEnergy Corp., in dollars per share     $ (13.44) $ 0.89 $ (2.56) $ 0.78 $ (0.53) $ 0.94 $ 0.44 $ 0.53 $ (14.49) $ 1.37 $ 0.71
Diluted - Earnings (losses) Available to FirstEnergy Corp., in dollars per share     $ (13.44) $ 0.89 $ (2.56) $ 0.77 $ (0.53) $ 0.93 $ 0.44 $ 0.53 $ (14.49) $ 1.37 $ 0.71
Equity contribution from parent $ 500 $ 500                      
FES                          
Quarterly Financial Data [Line Items]                          
REVENUES     $ 997 $ 1,100 $ 1,102 $ 1,199 $ 1,171 $ 1,338 $ 1,119 $ 1,377 $ 4,398 [2] $ 5,005 [2] $ 6,144 [2]
Other operating expenses     352 316 369 240 312 246 337 413 1,277 1,308 1,635
Pension and OPEB mark-to-market adjustment     48 0 0 0 57 0 0 0 48 57 297
Provision for depreciation     86 83 84 83 84 79 81 80 336 324 319
Impairment of assets     8,082 0 540 0 17 0 16 0 8,622 33 0
Operating Income (Loss)     (8,153) 101 (571) 226 25 240 0 12 (8,397) 277 (530)
Income (loss) before income taxes (benefits)     (8,171) 96 (581) 213 (13) 190 (25) (5)      
Income taxes (benefits)     (2,983) 56 (143) 82 1 70 (4) (2) (2,988) 65 (228)
NET INCOME (LOSS)     $ (5,188) $ 40 $ (438) $ 131 $ (14) $ 120 $ (21) $ (3) (5,455) $ 82 (244)
Earnings (loss) per share of common stock-                          
Equity contribution from parent                     $ 0   $ 500
[1] Includes excise tax collections of $406 million, $416 million and $420 million in 2016, 2015 and 2014, respectively.
[2] Includes excise tax collections of $28 million, $44 million and $69 million in 2016, 2015 and 2014, respectively.