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Earnings/(Loss) Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings/(Loss) Per Share | Earnings/(Loss) Per Share Basic earnings/(loss) per common share is computed by dividing net income/(loss) less accumulated preferred stock dividends by the weighted average number of common shares outstanding. Shares issued and treasury shares repurchased during the year are weighted for the portion of the year that they were outstanding. Diluted earnings/(loss) per share is computed in a manner consistent with that of basic earnings/(loss) per share while giving effect to all potentially dilutive common shares that were outstanding during the period. Dilutive effect for equity compensation and other equity instruments — The outstanding non-qualified stock options, non-vested restricted stock units, and market stock units are not considered outstanding for purposes of computing basic earnings/(loss) per share. However, these instruments are included in the denominator for purposes of computing diluted earnings/(loss) per share under the treasury stock method. The if-converted method was used to determine the dilutive effect of embedded derivatives in the Company's 2.822% Preferred Stock for the year ended December 31, 2015. During 2016, the Company repurchased 100% of the outstanding shares of its 2.822% preferred stock. The reconciliation of NRG's basic earnings/(loss) per share to diluted earnings/(loss) per share is shown in the following table:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In millions, except per share amounts)
Basic and diluted loss per share attributable to NRG common stockholders |  |  |  |  |
Net loss attributable to NRG Energy, Inc. | $ | (2,153 | ) |  | $ | (774 | ) |  | $ | (6,382 | )
Dividends for preferred shares | — |  |  | 5 |  |  | 20 |
Gain on redemption of 2.822% redeemable perpetual preferred shares | — |  |  | (78 | ) |  | — |
Loss Available to Common Stockholders | $ | (2,153 | ) |  | $ | (701 | ) |  | $ | (6,402 | )
Weighted average number of common shares outstanding | 317 |  |  | 316 |  |  | 329 |
Loss per weighted average common share — basic and diluted | $ | (6.79 | ) |  | $ | (2.22 | ) |  | $ | (19.46 | )
The following table summarizes NRG's outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company's diluted loss per share:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In millions of shares)
Equity compensation | 5 |  |  | 5 |  |  | 6 |
Embedded derivative of 2.822% redeemable perpetual preferred stock | — |  |  | — |  |  | 16 |
Total | 5 |  |  | 5 |  |  | 22 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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