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Earnings/(Loss) Per Share | 3 Months Ended
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Mar. 31, 2018
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 income/(loss) per share while giving effect to all potentially dilutive common shares that were outstanding during the period. The reconciliation of NRG's basic and diluted loss per share is shown in the following table:
| Three months ended March 31,
(In millions, except per share data) | 2018 |  | 2017
Basic income/(loss) per share attributable to NRG Energy, Inc. common stockholders
Net income/(loss) attributable to NRG Energy, Inc. | $ | 279 |  |  | $ | (163 | )
Weighted average number of common shares outstanding - basic | 318 |  |  | 316 |
Earnings/(loss) per weighted average common share — basic | $ | 0.88 |  |  | $ | (0.52 | )
Diluted income/(loss) per share attributable to NRG Energy, Inc. common stockholders
Weighted average number of common shares outstanding - diluted | 318 |  |  | 316 |
Incremental shares attributable to the issuance of equity compensation (treasury stock method) | 4 |  |  | — |
Total dilutive shares | 322 |  |  | 316 |
Earnings/(loss) per weighted average common share — diluted | $ | 0.87 |  |  | $ | (0.52 | )
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:
| Three months ended March 31,
(In millions of shares) | 2018 |  | 2017
Equity compensation plans | 1 |  |  | 6 |
Total | 1 |  |  | 6 |

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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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