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Organization and Basis of Presentation (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Regulatory assets on the Balance Sheets | The following table provides information about the composition of net regulatory assets as of December 31, 2016 and December 31, 2015, and the changes during the year ended December 31, 2016:
Regulatory Assets by Source |  | December 31, 2016 |  | December 31, 2015 |  | Increase (Decrease)
|  | (In millions)
Regulatory transition costs |  | $ | 90 |  |  | $ | 185 |  |  | $ | (95 | )
Customer receivables for future income taxes |  | 444 |  |  | 355 |  |  | 89 |
Nuclear decommissioning and spent fuel disposal costs |  | (304 | ) |  | (272 | ) |  | (32 | )
Asset removal costs |  | (470 | ) |  | (372 | ) |  | (98 | )
Deferred transmission costs |  | 127 |  |  | 115 |  |  | 12 |
Deferred generation costs |  | 215 |  |  | 243 |  |  | (28 | )
Deferred distribution costs |  | 296 |  |  | 335 |  |  | (39 | )
Contract valuations |  | 153 |  |  | 186 |  |  | (33 | )
Storm-related costs |  | 353 |  |  | 403 |  |  | (50 | )
Other |  | 110 |  |  | 170 |  |  | (60 | )
Net Regulatory Assets included on the Consolidated Balance Sheets |  | $ | 1,014 |  |  | $ | 1,348 |  |  | $ | (334 | )
Receivables from customers | Billed and unbilled customer receivables as of December 31, 2016 and 2015 are included below.
Customer Receivables |  | FirstEnergy |  | FES
|  | (In millions)
December 31, 2016 |  |  |  |
Billed |  | $ | 833 |  |  | $ | 123 |
Unbilled |  | 607 |  |  | 90 |
Total |  | $ | 1,440 |  |  | $ | 213 |
December 31, 2015 |  |  |  |
Billed |  | $ | 836 |  |  | $ | 165 |
Unbilled |  | 579 |  |  | 110 |
Total |  | $ | 1,415 |  |  | $ | 275 |
Reconciliation of basic and diluted earnings per share | The following table reconciles basic and diluted earnings (loss) per share of common stock:
Reconciliation of Basic and Diluted Earnings (Loss) per Share of Common Stock |  | 2016 |  | 2015 |  | 2014
|  | (In millions, except per share amounts)
Income (loss) from continuing operations available to common shareholders |  | $ | (6,177 | ) |  | $ | 578 |  |  | $ | 213 |
Discontinued operations (Note 20) |  | — |  |  | — |  |  | 86 |
Net income (loss) |  | $ | (6,177 | ) |  | $ | 578 |  |  | $ | 299 |
Weighted average number of basic shares outstanding |  | 426 |  |  | 422 |  |  | 420 |
Assumed exercise of dilutive stock options and awards(1) |  | — |  |  | 2 |  |  | 1 |
Weighted average number of diluted shares outstanding |  | 426 |  |  | 424 |  |  | 421 |
Earnings (loss) per share: |  |  |  |  |  |
Basic earnings (loss) per share: |  |  |  |  |  |
Continuing operations |  | $ | (14.49 | ) |  | $ | 1.37 |  |  | $ | 0.51 |
Discontinued operations (Note 20) |  | — |  |  | — |  |  | 0.20 |
Earnings (loss) per basic share |  | $ | (14.49 | ) |  | $ | 1.37 |  |  | $ | 0.71 |
Diluted earnings (loss) per share: |  |  |  |  |  |
Continuing operations |  | $ | (14.49 | ) |  | $ | 1.37 |  |  | $ | 0.51 |
Discontinued operations (Note 20) |  | — |  |  | — |  |  | 0.20 |
Earnings (loss) per diluted share |  | $ | (14.49 | ) |  | $ | 1.37 |  |  | $ | 0.71 |
(1) | For the year ended December 31, 2016, approximately three million shares were excluded from the calculation of diluted shares outstanding, as their inclusion would be antidilutive as a result of the net loss for the period. For the years ended December 31, 2015 and 2014, approximately one million and two million shares were excluded from the calculation of diluted shares outstanding, respectively, as their inclusion would be antidilutive.
Property, plant and equipment balances | balances by segment as of December 31, 2016 and 2015 were as follows:
|  | December 31, 2016
Property, Plant and Equipment |  | In Service(1) |  | Accum. Depr. |  | Net Plant |  | CWIP |  | Total PP&E
|  | (In millions)
Regulated Distribution(2) |  | $ | 24,979 |  |  | $ | (7,169 | ) |  | $ | 17,810 |  |  | $ | 472 |  |  | $ | 18,282 |
Regulated Transmission(2) |  | 9,342 |  |  | (1,948 | ) |  | 7,394 |  |  | 383 |  |  | 7,777 |
Competitive Energy Services(3) |  | 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 |
|  | December 31, 2015
Property, Plant and Equipment |  | In Service(1) |  | Accum. Depr. |  | Net Plant |  | CWIP |  | Total PP&E
|  | (In millions)
Regulated Distribution(2) |  | $ | 24,034 |  |  | $ | (6,865 | ) |  | $ | 17,169 |  |  | $ | 530 |  |  | $ | 17,699 |
Regulated Transmission(2) |  | 8,222 |  |  | (1,840 | ) |  | 6,382 |  |  | 484 |  |  | 6,866 |
Competitive Energy Services(3) |  | 17,214 |  |  | (6,213 | ) |  | 11,001 |  |  | 1,304 |  |  | 12,305 |
Corporate/Other |  | 482 |  |  | (242 | ) |  | 240 |  |  | 104 |  |  | 344 |
Total |  | $ | 49,952 |  |  | $ | (15,160 | ) |  | $ | 34,792 |  |  | $ | 2,422 |  |  | $ | 37,214 |
(1) Includes capital leases of $244 million and $253 million at December 31, 2016 and 2015, respectively. (2) Net plant in service of $326 million as of December 31, 2015 was reclassified to conform to the current presentation reflecting the transfer of certain transmission assets from Regulated Distribution to Regulated Transmission during the fourth quarter of 2016. See "Note 19, Segment Information", for more information. (3) Primarily consists of generating assets and nuclear fuel as discussed above. Property, plant and equipment balances for FES as of December 31, 2016 and 2015 were as follows:
|  | 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 |
|  | December 31, 2015
Property, Plant and Equipment |  | In Service |  | Accum. Depr. |  | Net Plant |  | CWIP |  | Total PP&E
|  | (In millions)
Fossil Generation |  | $ | 5,911 |  |  | $ | (1,937 | ) |  | $ | 3,974 |  |  | $ | 218 |  |  | $ | 4,192 |
Nuclear Generation |  | 5,617 |  |  | (1,574 | ) |  | 4,043 |  |  | 512 |  |  | 4,555 |
Nuclear Fuel |  | 2,616 |  |  | (2,198 | ) |  | 418 |  |  | 283 |  |  | 701 |
Other |  | 167 |  |  | (56 | ) |  | 111 |  |  | 144 |  |  | 255 |
Total |  | $ | 14,311 |  |  | $ | (5,765 | ) |  | $ | 8,546 |  |  | $ | 1,157 |  |  | $ | 9,703 |
Annual composite rates | The respective annual composite rates for FirstEnergy's and FES' electric plant in 2016, 2015 and 2014 are shown in the following table:
|  | Annual Composite Depreciation Rate
|  | 2016 |  | 2015 |  | 2014
FirstEnergy |  | 2.5 | % |  | 2.5 | % |  | 2.5 | %
FES |  | 3.3 | % |  | 3.2 | % |  | 3.1 | %
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 the changes in the carrying value of goodwill for the year ended December 31, 2016:
Goodwill |  | Regulated Distribution |  | Regulated Transmission |  | Competitive Energy Services |  | Consolidated
|  | (In millions)
Balance as of December 31, 2015 |  | $ | 5,092 |  |  | $ | 526 |  |  | $ | 800 |  |  | $ | 6,418 |
Impairment |  | — |  |  | — |  |  | (800 | ) |  | (800 | )
Transmission Segment (1) |  | (88 | ) |  | 88 |  |  | — |  |  | — |
Balance as of December 31, 2016 |  | $ | 5,004 |  |  | $ | 614 |  |  | $ | — |  |  | $ | 5,618 |
(1) See Note 19, Segment Information for discussion of transfer of certain transmission assets from the Regulated Distribution segment to the Regulated Transmission segment during the fourth quarter of 2016, resulting in the transfer of $88 million of goodwill between the segments based on the relative fair value of the transmission assets to fair value of the Regulated Distribution segment.

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