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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.

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