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Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Reconciliation of NRG's basic and diluted (loss)/income per share | The reconciliation of NRG's basic and diluted income per share is shown in the following table:
| Three months ended September 30, |  | Nine months ended September 30,
(In millions, except per share data) | 2021 |  | 2020 |  | 2021 |  | 2020
Basic income per share: |  |  |  |
Net income | $ | 1,618 |  |  | $ | 249 |  |  | $ | 2,614 |  |  | $ | 683 |
Weighted average number of common shares outstanding - basic | 245 |  |  | 244 |  |  | 245 |  |  | 246 |
Income per weighted average common share — basic | $ | 6.60 |  |  | $ | 1.02 |  |  | $ | 10.67 |  |  | $ | 2.78 |
Diluted income per share: |  |  |  |
Net income | $ | 1,618 |  |  | $ | 249 |  |  | $ | 2,614 |  |  | $ | 683 |
Weighted average number of common shares outstanding - basic | 245 |  |  | 244 |  |  | 245 |  |  | 246 |
Incremental shares attributable to the issuance of equity compensation (treasury stock method) | — |  |  | 1 |  |  | — |  |  | 1 |
Weighted average number of common shares outstanding - dilutive | 245 |  |  | 245 |  |  | 245 |  |  | 247 |
Income per weighted average common share — diluted | $ | 6.60 |  |  | $ | 1.02 |  |  | $ | 10.67 |  |  | $ | 2.77 |

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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=124432515&loc=d3e3550-109257 + Details
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