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Organization and Basis of Presentation (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Regulatory assets on the Balance Sheets | The following table provides information about the composition of net regulatory assets and liabilities as of December 31, 2017 and December 31, 2016, and the changes during the year ended December 31, 2017:
Net Regulatory Assets (Liabilities) by Source |  | December 31, 2017 |  | December 31, 2016 |  | Increase (Decrease)
|  | (In millions)
Regulatory transition costs |  | $ | 46 |  |  | $ | 90 |  |  | $ | (44 | )
Customer receivables (payables) for future income taxes |  | (2,765 | ) |  | 468 |  |  | (3,233 | )
Nuclear decommissioning and spent fuel disposal costs |  | (323 | ) |  | (304 | ) |  | (19 | )
Asset removal costs |  | (774 | ) |  | (770 | ) |  | (4 | )
Deferred transmission costs |  | 187 |  |  | 122 |  |  | 65 |
Deferred generation costs |  | 198 |  |  | 331 |  |  | (133 | )
Deferred distribution costs |  | 258 |  |  | 296 |  |  | (38 | )
Contract valuations |  | 118 |  |  | 153 |  |  | (35 | )
Storm-related costs |  | 329 |  |  | 397 |  |  | (68 | )
Other |  | 46 |  |  | 74 |  |  | (28 | )
Net Regulatory Assets (Liabilities) included on the Consolidated Balance Sheets |  | $ | (2,680 | ) |  | $ | 857 |  |  | $ | (3,537 | )
Receivables from customers | Billed and unbilled customer receivables as of December 31, 2017 and 2016 are included below.
Customer Receivables |  | FirstEnergy |  | FES
|  | (In millions)
December 31, 2017 |  |  |  |
Billed |  | $ | 860 |  |  | $ | 106 |
Unbilled |  | 603 |  |  | 75 |
Total |  | $ | 1,463 |  |  | $ | 181 |
December 31, 2016 |  |  |  |
Billed |  | $ | 833 |  |  | $ | 123 |
Unbilled |  | 607 |  |  | 90 |
Total |  | $ | 1,440 |  |  | $ | 213 |
Reconciliation of basic and diluted earnings per share |
Reconciliation of Basic and Diluted Earnings (Loss) per Share of Common Stock |  | 2017 |  | 2016 |  | 2015
|  | (In millions, except per share amounts)
Net income (loss) |  | $ | (1,724 | ) |  | $ | (6,177 | ) |  | $ | 578 |
Weighted average number of basic shares outstanding |  | 444 |  |  | 426 |  |  | 422 |
Assumed exercise of dilutive stock options and awards(1) |  | — |  |  | — |  |  | 2 |
Weighted average number of diluted shares outstanding |  | 444 |  |  | 426 |  |  | 424 |
Basic earnings (loss) per share of common stock |  | $ | (3.88 | ) |  | $ | (14.49 | ) |  | $ | 1.37 |
Diluted earnings (loss) per share of common stock |  | $ | (3.88 | ) |  | $ | (14.49 | ) |  | $ | 1.37 |
(1) | For the years ended December 31, 2017, 2016 and 2015, approximately three million, three million and one million shares were excluded from the calculation of diluted shares outstanding, respectively, as their inclusion would be antidilutiv
Property, plant and equipment balances | Property, plant and equipment balances for FES as of December 31, 2017 and 2016 were as follows:
|  | December 31, 2017
Property, Plant and Equipment |  | In Service |  | Accum. Depr. |  | Net Plant |  | CWIP |  | Total PP&E
|  | (In millions)
Fossil Generation |  | $ | 2,344 |  |  | $ | (1,743 | ) |  | $ | 601 |  |  | $ | 19 |  |  | $ | 620 |
Other |  | 151 |  |  | (80 | ) |  | 71 |  |  | 3 |  |  | 74 |
Total |  | $ | 2,495 |  |  | $ | (1,823 | ) |  | $ | 672 |  |  | $ | 22 |  |  | $ | 694 |
|  | December 31, 2016
Property, Plant and Equipment |  | In Service |  | Accum. Depr. |  | Net Plant |  | CWIP |  | Total PP&E
|  | (In millions)
Fossil Generation |  | $ | 2,212 |  |  | $ | (1,720 | ) |  | $ | 492 |  |  | $ | 63 |  |  | $ | 555 |
Nuclear Generation |  | 2,065 |  |  | (1,723 | ) |  | 342 |  |  | 118 |  |  | 460 |
Nuclear Fuel |  | 2,637 |  |  | (2,418 | ) |  | 219 |  |  | 241 |  |  | 460 |
Other |  | 143 |  |  | (68 | ) |  | 75 |  |  | 5 |  |  | 80 |
Total |  | $ | 7,057 |  |  | $ | (5,929 | ) |  | $ | 1,128 |  |  | $ | 427 |  |  | $ | 1,555 |
Property, plant and equipment balances by segment as of December 31, 2017 and 2016 were as follows:
|  | December 31, 2017
Property, Plant and Equipment |  | In Service(1) |  | Accum. Depr. |  | Net Plant |  | CWIP |  | Total PP&E
|  | (In millions)
Regulated Distribution |  | $ | 25,950 |  |  | $ | (7,503 | ) |  | $ | 18,447 |  |  | $ | 469 |  |  | $ | 18,916 |
Regulated Transmission |  | 10,102 |  |  | (2,055 | ) |  | 8,047 |  |  | 480 |  |  | 8,527 |
Competitive Energy Services(2) |  | 2,902 |  |  | (1,958 | ) |  | 944 |  |  | 28 |  |  | 972 |
Corporate/Other |  | 824 |  |  | (409 | ) |  | 415 |  |  | 49 |  |  | 464 |
Total |  | $ | 39,778 |  |  | $ | (11,925 | ) |  | $ | 27,853 |  |  | $ | 1,026 |  |  | $ | 28,879 |
|  | December 31, 2016
Property, Plant and Equipment |  | In Service(1) |  | Accum. Depr. |  | Net Plant |  | CWIP |  | Total PP&E
|  | (In millions)
Regulated Distribution |  | $ | 24,979 |  |  | $ | (7,169 | ) |  | $ | 17,810 |  |  | $ | 472 |  |  | $ | 18,282 |
Regulated Transmission |  | 9,342 |  |  | (1,948 | ) |  | 7,394 |  |  | 383 |  |  | 7,777 |
Competitive Energy Services(2) |  | 8,680 |  |  | (6,267 | ) |  | 2,413 |  |  | 453 |  |  | 2,866 |
Corporate/Other |  | 766 |  |  | (347 | ) |  | 419 |  |  | 43 |  |  | 462 |
Total |  | $ | 43,767 |  |  | $ | (15,731 | ) |  | $ | 28,036 |  |  | $ | 1,351 |  |  | $ | 29,387 |
(1) Includes capital leases of $238 million and $244 million at December 31, 2017 and 2016, respectively. (2) Primarily consists of generating assets and nuclear fuel as discussed above.
Annual composite rates | The respective annual composite rates for FirstEnergy's and FES' electric plant in 2017, 2016 and 2015 are shown in the following table:
|  | Annual Composite Depreciation Rate
|  | 2017 |  | 2016 |  | 2015
FirstEnergy |  | 2.4 | % |  | 2.5 | % |  | 2.5 | %
FES |  | 4.4 | % |  | 3.3 | % |  | 3.2 | %
Summary of changes in goodwill | FirstEnergy's reporting units are consistent with its reportable segments and consist of Regulated Distribution, Regulated Transmission, and CES. The following table presents goodwill by reporting unit for the year ended December 31, 2017:
Goodwill |  | Regulated Distribution |  | Regulated Transmission |  | Consolidated
|  | (In millions)
Balance as of December 31, 2017 |  | $ | 5,004 |  |  | $ | 614 |  |  | $ | 5,618 |
FirstEnergy tests goodwill for impairment annually as of July 31 and considers more frequent testing if indicators of potential impairment arise.

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