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Capital Structure (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2015 | 416,939,950 |  |  | (102,749,908 | ) |  | 314,190,042 |
Shares issued under ESPP | — |  |  | 609,094 |  |  | 609,094 |
Shares issued under LTIPs | 643,875 |  |  | — |  |  | 643,875 |
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 |
NRG's common stock reserved for the maximum number of shares potentially issuable based on the conversion and redemption features of outstanding equity instruments and the long-term incentive plans | The following table summarizes NRG's common stock reserved for the maximum number of shares potentially issuable based on the conversion and redemption features of the long-term incentive plans as of December 31, 2018:
Equity Instrument | Common Stock Reserve Balance
Long-term incentive plans | 17,631,031 |
Summary of shares repurchased | Share Repurchases — In 2018, the Company's board of directors authorized the Company to repurchase $1.5 billion of its common stock. In addition, the Company's board of directors authorized in February 2019 an additional $1.0 billion share repurchase program to be executed in 2019. The following table summarizes the shares repurchased under the 2018 program, including shares repurchased under two completed accelerated repurchase agreements:
| Total number of shares purchased | Average price paid per share | Amounts paid for shares purchased (in millions)
Open market repurchases | 11,097,631 |  |  | $ | 396 |
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 |
Total Share Repurchases as of December 31, 2018 | 35,234,664 |  |  | 1,250 |
Additional open market repurchases through February 28, 2019 | 6,153,415 |  |  | 250 |
Total Share Repurchases as of February 28, 2019 | 41,388,079 |  | $ | 36.24 |  | $ | 1,500 |
Changes in redeemable preferred stock | The following table reflects the changes in the Company's redeemable preferred stock balance for the years ended December 31, 2018, 2017, and 2016:
| (In millions)
Balance as of December 31, 2015 | $ | 302 |
Accretion to redemption value | 2 |
Repurchase of 2.822% redeemable preferred stock | (226 | )
Gain on redemption of 2.822% redeemable preferred stock | (78 | )
Balance as of December 31, 2016 | $ | — |
Balance as of December 31, 2017 | $ | — |
Balance as of December 31, 2018 | $ | — |

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- Definition Disclosure of the information related to the common stock reserved for the maximum number of potentially issuable shares based on the conversion and redemption features of outstanding equity instruments and the long-term incentive plan as of period end. + References No definition available. + Details
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- Definition Tabular disclosure of temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 + Details
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