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Capital Structure (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2018 |  |  | 420,288,886 |  |  | (136,638,847) |  |  | 283,650,039 |
Shares issued under ESPP |  |  | — |  |  | 46,128 |  |  | 46,128 |
Shares issued under LTIPs |  |  | 1,601,904 |  |  | — |  |  | 1,601,904 |
Share repurchases |  |  | — |  |  | (36,301,882) |  |  | (36,301,882) |
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 LTIPs |  |  | 288,491 |  |  | — |  |  | 288,491 |
Share repurchases |  |  | — |  |  | (1,889,151) |  |  | (1,889,151) |
Balance as of February 24, 2022 |  |  | 423,835,665 |  |  | (181,682,426) |  |  | 242,153,239 |
Summary of shares repurchased | The following table summarizes the shares repurchases made during the years ended December 31, 2019, 2020 and 2021 as well as through February 24, 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)
2019 repurchases: |  |  |
Repurchases under February 28, 2019 Accelerated Share Repurchase Agreement | 9,438,671 |  |  | 400 |
Other repurchases(a) | 26,863,211 |  |  | 1,008 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(b) | 936,928 |  |  | 36 |
Total Share Repurchases during 2019 | 37,238,810 |  | $ | 38.79 |  | $ | 1,444 |
2020 repurchases: |  |  |
Repurchases | 6,062,783 |  |  | 197 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(b) | 711,248 |  |  | 27 |
Total Share Repurchases during 2020 | 6,774,031 |  | $ | 33.05 |  | $ | 224 |
2021 repurchases: |  |  |
Repurchases(a) | 1,084,752 |  |  | 44 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(b) | 249,013 |  |  | 9 |
Total Share Repurchases during 2021 | 1,333,765 |  | $ | 40.22 |  | $ | 53 |
2022 repurchases: |  |  |
Repurchases made subsequent to December 31, 2021 | 1,889,151 |  |  | 76 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(b) | 130,674 |  |  | 6 |
Total share repurchases January 1, 2021 through February 24, 2022 | 2,019,825 |  | $ | 40.26 |  | $ | 82 |
(a)Includes $5 million and $4 million accrued as of December 31, 2021 and December 31,2019, respectively (b)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 $43.08, $37.50, $38.23 and $38.78 in 2022, 2021, 2020 and 2019, respectively. See Note 21, Stock-Based Compensation, for further discussion of the equity awards

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