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Changes in Capital Structure (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Changes in NRG's common shares issued and outstanding | The following table reflects the changes in NRG's common stock issued and outstanding:
| Issued |  | Treasury |  | Outstanding
Balance as of December 31, 2018 | 420,288,886 |  |  | (136,638,847 | ) |  | 283,650,039 |
Shares issued under LTIPs | 1,497,175 |  |  | — |  |  | 1,497,175 |
Shares repurchased | — |  |  | (17,608,957 | ) |  | (17,608,957 | )
Balance as of March 31, 2019 | 421,786,061 |  |  | (154,247,804 | ) |  | 267,538,257 |
Shares Repurchased | The following repurchases have been made during the three months ended March 31, 2019 and through May 2, 2019:
| Total number of shares purchased |  | Amounts paid for shares purchased (in millions)
Board Authorized Share Repurchases |  |  |
2018 program: |  |  |
Repurchases made during January-February to complete the 2018 program | 6,153,415 |  |  | $ | 250 |
2019 program: |  |  |
Shares repurchased under February 28, 2019 Accelerated Share Repurchase Agreement | 9,086,903 |  |  | 400 |
March repurchases | 2,368,639 |  |  | 99 |
Total Share Repurchases during the three months ended March 31, 2019 | 17,608,957 |  |  | $ | 749 |
Additional shares delivered upon ASR settlement in April | 351,768 |  |  | — |
April repurchases | 39,140 |  |  | 1 |
Total Share Repurchases during the period ended May 2, 2019 | 17,999,865 |  |  | $ | 750 |

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