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Summary of Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
SUMMARY OF QUARTERLY FINANCIAL DATA (UNAUDITED) | SUMMARY OF QUARTERLY FINANCIAL DATA (UNAUDITED) The following summarizes certain consolidated operating results by quarter for 2017 and 2016.
FirstEnergy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED STATEMENTS OF INCOME (LOSS)
(In millions, except per share amounts) | 2017 |  | 2016
| Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues | $ | 3,442 |  |  | $ | 3,714 |  |  | $ | 3,309 |  |  | $ | 3,552 |  |  | $ | 3,375 |  |  | $ | 3,917 |  |  | $ | 3,401 |  |  | $ | 3,869 |
Other operating expense | 1,195 |  |  | 940 |  |  | 956 |  |  | 1,141 |  |  | 1,021 |  |  | 950 |  |  | 963 |  |  | 917 |
Pension and OPEB mark-to-market adjustment | 141 |  |  | — |  |  | — |  |  | — |  |  | 147 |  |  | — |  |  | — |  |  | — |
Provision for depreciation | 293 |  |  | 289 |  |  | 281 |  |  | 275 |  |  | 339 |  |  | 311 |  |  | 334 |  |  | 329 |
Impairment of assets and related charges | 2,244 |  |  | 31 |  |  | 131 |  |  | — |  |  | 9,218 |  |  | — |  |  | 1,447 |  |  | — |
Operating Income (Loss) | (1,830 | ) |  | 884 |  |  | 544 |  |  | 574 |  |  | (8,924 | ) |  | 861 |  |  | (975 | ) |  | 776 |
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 |
Net Income (Loss) | (2,499 | ) |  | 396 |  |  | 174 |  |  | 205 |  |  | (5,796 | ) |  | 380 |  |  | (1,089 | ) |  | 328 |
Earnings (loss) per share of common stock-(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic - Earnings (losses) Available to FirstEnergy Corp. | (5.62 | ) |  | 0.89 |  |  | 0.39 |  |  | 0.46 |  |  | (13.44 | ) |  | 0.89 |  |  | (2.56 | ) |  | 0.78 |
Diluted - Earnings (losses) Available to FirstEnergy Corp. | (5.62 | ) |  | 0.89 |  |  | 0.39 |  |  | 0.46 |  |  | (13.44 | ) |  | 0.89 |  |  | (2.56 | ) |  | 0.77 |
(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. See FirstEnergy's Consolidated Statements of Stockholders' Equity and Note 5, "Stock-Based Compensation Plans," for additional information.
FES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED STATEMENTS OF INCOME (LOSS)
(In millions) | 2017 |  | 2016
| Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues | $ | 700 |  |  | $ | 743 |  |  | $ | 741 |  |  | $ | 914 |  |  | $ | 997 |  |  | $ | 1,100 |  |  | $ | 1,102 |  |  | $ | 1,199 |
Other operating expense | 419 |  |  | 291 |  |  | 286 |  |  | 518 |  |  | 352 |  |  | 316 |  |  | 369 |  |  | 240 |
Pension and OPEB mark-to-market adjustment | 24 |  |  | — |  |  | — |  |  | — |  |  | 48 |  |  | — |  |  | — |  |  | — |
Provision for depreciation | 29 |  |  | 28 |  |  | 27 |  |  | 25 |  |  | 86 |  |  | 83 |  |  | 84 |  |  | 83 |
Impairment of assets and related charges | 2,031 |  |  | — |  |  | — |  |  | — |  |  | 8,082 |  |  | — |  |  | 540 |  |  | — |
Operating Income (Loss) | (2,112 | ) |  | 102 |  |  | 61 |  |  | (117 | ) |  | (8,153 | ) |  | 101 |  |  | (571 | ) |  | 226 |
Income (loss) from continuing operations 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 |
Net Income (Loss) | (2,406 | ) |  | 76 |  |  | 19 |  |  | (80 | ) |  | (5,188 | ) |  | 40 |  |  | (438 | ) |  | 131 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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