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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Reconciliation of NRG's basic and diluted earnings per share | The reconciliation of NRG's basic income/(loss) per share to diluted income/(loss) per share is shown in the following table:
| Year Ended December 31,
(In millions, except per share amounts) | 2020 |  | 2019 |  | 2018
Basic income per share attributable to NRG, Inc; |  |  |  |  |
Net income attributable to NRG Energy, Inc. common stockholders | $ | 510 |  |  | $ | 4,438 |  |  | $ | 268 |
Weighted average number of common shares outstanding-basic | 245 |  |  | 262 |  |  | 304 |
Income per weighted average common share — basic | $ | 2.08 |  |  | $ | 16.94 |  |  | $ | 0.88 |
Diluted income per share attributable to NRG, Inc; |  |  |  |  |
Net income attributable to NRG Energy, Inc. common stockholders | $ | 510 |  |  | $ | 4,438 |  |  | $ | 268 |
Weighted average number of common shares outstanding-basic | 245 |  |  | 262 |  |  | 304 |
Incremental shares attributable to the issuance of equity compensation (treasury stock method) | 1 |  |  | 2 |  |  | 4 |
Weighted average number of common shares outstanding-diluted | 246 |  |  | 264 |  |  | 308 |
Income per weighted average common share — diluted | $ | 2.07 |  |  | $ | 16.81 |  |  | $ | 0.87 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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