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Capital Structure (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Changes in NRG's common shares issued and outstanding | The following table reflects the changes in NRG's common shares issued and outstanding for each period presented:
|  |  | Common Shares
|  |  | Issued |  | Treasury |  | Outstanding
Balance as of December 31, 2019 |  |  | 421,890,790 |  |  | (172,894,601) |  |  | 248,996,189 |
Shares issued under ESPP |  |  | — |  |  | 131,469 |  |  | 131,469 |
Shares issued under LTIPs |  |  | 1,167,058 |  |  | — |  |  | 1,167,058 |
Share repurchases |  |  | — |  |  | (6,062,783) |  |  | (6,062,783) |
Balance as of December 31, 2020 |  |  | 423,057,848 |  |  | (178,825,915) |  |  | 244,231,933 |
Shares issued under ESPP |  |  | — |  |  | 117,392 |  |  | 117,392 |
Shares issued under LTIPs |  |  | 489,326 |  |  | — |  |  | 489,326 |
Share repurchases |  |  | — |  |  | (1,084,752) |  |  | (1,084,752) |
Balance as of December 31, 2021 |  |  | 423,547,174 |  |  | (179,793,275) |  |  | 243,753,899 |
Shares issued under ESPP |  |  | — |  |  | 142,825 |  |  | 142,825 |
Shares issued under LTIPs |  |  | 349,827 |  |  | — |  |  | 349,827 |
Share repurchases |  |  | — |  |  | (14,685,521) |  |  | (14,685,521) |
Balance as of December 31, 2022 |  |  | 423,897,001 |  |  | (194,335,971) |  |  | 229,561,030 |
Shares issued under LTIPs |  |  | 213,208 |  |  | — |  |  | 213,208 |
Balance as of February 15, 2023 |  |  | 424,110,209 |  |  | (194,335,971) |  |  | 229,774,238 |
Summary of shares repurchased | The following table summarizes the shares repurchases made during the years ended December 31, 2020, 2021 and 2022:
| Total number of shares and share equivalents purchased | Average price paid per share and share equivalent | Amounts paid for shares and share equivalents purchased (in millions)
2020 repurchases: |  |  |
Repurchases | 6,062,783 |  |  | 197 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(a) | 711,248 |  |  | 27 |
Total Share Repurchases during 2020 | 6,774,031 |  | $ | 33.05 |  | $ | 224 |
2021 repurchases: |  |  |
Repurchases(b) | 1,084,752 |  |  | 44 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(a) | 249,013 |  |  | 9 |
Total Share Repurchases during 2021 | 1,333,765 |  | $ | 40.22 |  | $ | 53 |
2022 repurchases: |  |  |
Repurchases | 14,685,521 |  |  | 595 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(a) | 151,241 |  |  | 6 |
Total Share Repurchases during 2022 | 14,836,762 |  | $ | 40.50 |  | $ | 601 |
(a)NRG elected to pay cash for tax withholding on equity awards instead of issuing actual shares to management. The average price per equivalent shares withheld was $42.74, $37.50 and $38.23 in 2022, 2021 and 2020, respectively. See Note 21, Stock-Based Compensation, for further discussion of the equity awards (b)Includes $5 million accrued as of December 31, 2021

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