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Capital Structure (Tables) | 12 Months Ended
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Dec. 31, 2019
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 |  |  |  |
|  |  | Issued |  | Treasury |  | Outstanding
Balance as of December 31, 2016 |  |  | 417,583,825 |  |  | (102,140,814) |  |  | 315,443,011 |
Shares issued under ESPP |  |  | — |  |  | 560,769 |  |  | 560,769 |
Shares issued under LTIPs |  |  | 739,309 |  |  | — |  |  | 739,309 |
Balance as of December 31, 2017 |  |  | 418,323,134 |  |  | (101,580,045) |  |  | 316,743,089 |
Shares issued under ESPP |  |  | — |  |  | 175,862 |  |  | 175,862 |
Shares issued under LTIPs |  |  | 1,965,752 |  |  | — |  |  | 1,965,752 |
Share repurchases |  |  | — |  |  | (35,234,664) |  |  | (35,234,664) |
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 |
Summary of shares repurchased | The following table summarizes the shares repurchases made from 2018 through February 27, 2020:
| 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) |
2018 repurchases: |  |  |
Shares repurchased under May 24, 2018 Accelerated Repurchase Agreement | 10,829,903 |  |  | 354 |
Shares repurchased under September 5, 2018 Accelerated Repurchase Agreement | 13,307,130 |  |  | 500 |
Other repurchases | 11,097,631 |  |  | 396 |
Total Share Repurchases during 2018 | 35,234,664 |  | $35.48 | $ | 1,250 |
2019 repurchases: |  |  |
Repurchases under February 28, 2019 Accelerated Share Repurchase Agreement | 9,438,671 |  |  | 400 |
Other repurchases | 26,863,211 |  |  | 1,008 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(a) | 936,928 |  |  | 36 |
Total Share Repurchases during 2019 | 37,238,810 |  | $ | 38.79 |  | $ | 1,444 |
2020 repurchases: |  |  |
Repurchases made subsequent to December 31, 2019 | 2,428,545 |  |  |  | 92 |
Equivalent shares purchased in lieu of tax withholdings on equity compensation issuances(a) | 709,536 |  |  | 27 |
Total share repurchases January 1, 2020 through February 27, 2020 | 3,138,081 |  | $ | 37.87 |  | $ | 119 |
(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 $38.24 and $38.78 in 2020 and 2019, respectively. See Note 21, Stock-Based Compensation, for further discussion of the equity awards

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