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v3.22.2

Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares | 1 Months Ended | 3 Months Ended | 6 Months Ended | 7 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2022 | Jul. 31, 2022 | Dec. 31, 2021
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  | 500,000,000 | 500,000,000 |  | 500,000,000
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Balance as of beginning of period (in shares) | 423,868,387 |  | 423,547,174 | 423,547,174 |
Treasury shares, balance as of beginning of period (in shares) | (188,722,366) |  | (179,793,275) | (179,793,275) |
Outstanding, as of beginning of period (in shares) | 235,146,021 |  | 243,753,899 | 243,753,899 |
Stock issued under ESPP (in shares) |  | 1,000,000 |  |  |
Shares repurchased (in shares) |  |  | (8,998,032) |  |
Balance as of end of period (in shares) |  | 423,868,387 | 423,868,387 |  |
Treasury shares, balance as of end of the period (in shares) |  | (188,722,366) | (188,722,366) |  |
Outstanding, as of end of period (in shares) |  | 235,146,021 | 235,146,021 |  |
Shares issued under LTIPs |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Shares issued under LTIPs (in shares) |  |  | 321,213 |  |
Shares issued under ESPP |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Stock issued under ESPP (in shares) |  |  | 68,941 |  |
Subsequent Event |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Outstanding, as of end of period (in shares) | 235,147,142 |  |  | 235,147,142 |
Subsequent Event | Shares issued under LTIPs |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Shares issued under LTIPs (in shares) | 1,121 |  |  |  |
Common Stock |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Balance as of beginning of period (in shares) | 423,868,387 |  | 423,547,174 | 423,547,174 |
Shares repurchased (in shares) |  |  | 0 |  |
Balance as of end of period (in shares) |  | 423,868,387 | 423,868,387 |  |
Common Stock | Shares issued under LTIPs |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Shares issued under LTIPs (in shares) |  |  | 321,213 |  |
Common Stock | Shares issued under ESPP |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Stock issued under ESPP (in shares) |  |  | 0 |  |
Common Stock | Subsequent Event |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Balance as of end of period (in shares) | 423,869,508 |  |  | 423,869,508 |
Common Stock | Subsequent Event | Shares issued under LTIPs |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Shares issued under LTIPs (in shares) | 1,121 |  |  |  |
Treasury |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Treasury shares, balance as of beginning of period (in shares) | (188,722,366) |  | (179,793,275) | (179,793,275) |
Shares repurchased (in shares) |  |  | (8,998,032) |  |
Treasury shares, balance as of end of the period (in shares) |  | (188,722,366) | (188,722,366) |  |
Treasury | Shares issued under LTIPs |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Shares issued under LTIPs (in shares) |  |  | 0 |  |
Treasury | Shares issued under ESPP |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Stock issued under ESPP (in shares) |  |  | 68,941 |  |
Treasury | Subsequent Event |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Treasury shares, balance as of end of the period (in shares) | (188,722,366) |  |  | (188,722,366) |
Treasury | Subsequent Event | Shares issued under LTIPs |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |
Shares issued under LTIPs (in shares) | 0 |  |  |  |

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