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Earnings/(Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Reconciliation of NRG's basic and diluted earnings per share | The reconciliation of NRG's basic and diluted loss per share is shown in the following table:
| Three months ended June 30, |  | Six months ended June 30,
In millions, except per share data | 2018 |  | 2017 |  | 2018 |  | 2017
Basic income/(loss) per share attributable to NRG Energy, Inc. common stockholders
Net income/(loss) attributable to NRG Energy, Inc. | $ | 72 |  |  | $ | (626 | ) |  | $ | 351 |  |  | $ | (790 | )
Weighted average number of common shares outstanding - basic | 310 |  |  | 316 |  |  | 314 |  |  | 316 |
Earnings/(loss) per weighted average common share — basic | $ | 0.23 |  |  | $ | (1.98 | ) |  | $ | 1.12 |  |  | $ | (2.50 | )
Diluted income/(loss) per share attributable to NRG Energy, Inc. common stockholders |  |  |  |
Weighted average number of common shares outstanding - diluted | 310 |  |  | 316 |  |  | 314 |  |  | 316 |
Incremental shares attributable to the issuance of equity compensation (treasury stock method) | 4 |  |  | — |  |  | 4 |  |  | — |
Total dilutive shares | 314 |  |  | 316 |  |  | 318 |  |  | 316 |
Earnings/(loss) per weighted average common share — diluted | $ | 0.23 |  |  | $ | (1.98 | ) |  | $ | 1.10 |  |  | $ | (2.50 | )
Summary of NRG's outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company's diluted earnings per share | 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 June 30, |  | Six months ended June 30,
In millions of shares | 2018 |  | 2017 |  | 2018 |  | 2017
Equity compensation plans | — |  |  | 6 |  |  | 1 |  |  | 6 |
Total | — |  |  | 6 |  |  | 1 |  |  | 6 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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