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Summary of Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information | The following summarizes certain consolidated operating results by quarter for 2016 and 2015.
FirstEnergy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED STATEMENTS OF INCOME (LOSS)
(In millions, except per share amounts) | 2016 |  | 2015
| Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues | $ | 3,375 |  |  | $ | 3,917 |  |  | $ | 3,401 |  |  | $ | 3,869 |  |  | $ | 3,541 |  |  | $ | 4,123 |  |  | $ | 3,465 |  |  | $ | 3,897 |
Other operating expense | 1,023 |  |  | 953 |  |  | 964 |  |  | 918 |  |  | 950 |  |  | 842 |  |  | 900 |  |  | 1,057 |
Pension and OPEB mark-to-market adjustment | 147 |  |  | — |  |  | — |  |  | — |  |  | 242 |  |  | — |  |  | — |  |  | — |
Provision for depreciation | 339 |  |  | 311 |  |  | 334 |  |  | 329 |  |  | 313 |  |  | 328 |  |  | 322 |  |  | 319 |
Impairment of assets | 9,218 |  |  | — |  |  | 1,447 |  |  | — |  |  | 18 |  |  | 8 |  |  | 16 |  |  | — |
Operating Income (Loss) | (8,924 | ) |  | 861 |  |  | (975 | ) |  | 776 |  |  | 236 |  |  | 908 |  |  | 554 |  |  | 594 |
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 |
Net Income (Loss) | (5,796 | ) |  | 380 |  |  | (1,089 | ) |  | 328 |  |  | (226 | ) |  | 395 |  |  | 187 |  |  | 222 |
Earnings (loss) per share of common stock-(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic - Earnings (losses) Available to FirstEnergy Corp. | (13.44 | ) |  | 0.89 |  |  | (2.56 | ) |  | 0.78 |  |  | (0.53 | ) |  | 0.94 |  |  | 0.44 |  |  | 0.53 |
Diluted - Earnings (losses) Available to FirstEnergy Corp. | (13.44 | ) |  | 0.89 |  |  | (2.56 | ) |  | 0.77 |  |  | (0.53 | ) |  | 0.93 |  |  | 0.44 |  |  | 0.53 |
(1) - The sum of quarterly earnings per share information may not equal annual earnings per share due to the issuance of shares throughout the year and the $500 million equity issuance in December 2016. See FirstEnergy's Consolidated Statements of Stockholders' Equity, "Note 5, Stock-Based Compensation Plans" and "Note 12, Capitalization" for additional information.
FES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED STATEMENTS OF INCOME (LOSS)
(In millions) | 2016 |  | 2015
| Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues | $ | 997 |  |  | $ | 1,100 |  |  | $ | 1,102 |  |  | $ | 1,199 |  |  | $ | 1,171 |  |  | $ | 1,338 |  |  | $ | 1,119 |  |  | $ | 1,377 |
Other operating expense | 352 |  |  | 316 |  |  | 369 |  |  | 240 |  |  | 312 |  |  | 246 |  |  | 337 |  |  | 413 |
Pension and OPEB mark-to-market adjustment | 48 |  |  | — |  |  | — |  |  | — |  |  | 57 |  |  | — |  |  | — |  |  | — |
Provision for depreciation | 86 |  |  | 83 |  |  | 84 |  |  | 83 |  |  | 84 |  |  | 79 |  |  | 81 |  |  | 80 |
Impairment of assets | 8,082 |  |  | — |  |  | 540 |  |  | — |  |  | 17 |  |  | — |  |  | 16 |  |  | — |
Operating Income (Loss) | (8,153 | ) |  | 101 |  |  | (571 | ) |  | 226 |  |  | 25 |  |  | 240 |  |  | — |  |  | 12 |
Income (loss) from continuing operations 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 | )
Net Income (Loss) | (5,188 | ) |  | 40 |  |  | (438 | ) |  | 131 |  |  | (14 | ) |  | 120 |  |  | (21 | ) |  | (3 | )

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