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v3.23.1

Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 09, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |  |
Common stock, shares authorized (in shares) |  | 500,000,000 | 500,000,000
Schedule of Stock by Class, Equity [Roll Forward] |  |  |
Common, Balance as of beginning of period (in shares) |  | 423,897,001 |
Treasury, Balance as of end of period (in shares) |  | (194,335,971) |
Common, Outstanding, as of beginning of period (in shares) |  | 229,561,030 |
Preferred, Balance as of end of period (in shares) |  | 650,000 |
Common, Balance as of end of period (in shares) |  | 424,292,409 |
Treasury, Balance as of end of period (in shares) |  | (194,335,971) |
Preferred, Outstanding as of end of period (in shares) |  | 650,000 |
Common, Outstanding, as of end of period (in shares) |  | 229,956,438 |
Shares issued under LTIPs |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |
Shares issued under LTIPs (in shares) |  | 395,408 |
Preferred Stock | Series A Preferred Stock |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |
Issuance of Series A Preferred Stock (in shares) | 650,000 | 650,000 |
Common Stock |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |
Common, Balance as of beginning of period (in shares) |  | 423,897,001 |
Common, Balance as of end of period (in shares) |  | 424,292,409 |
Common Stock | Shares issued under LTIPs |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |
Shares issued under LTIPs (in shares) |  | 395,408 |
Treasury Stock |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |
Treasury, Balance as of end of period (in shares) |  | (194,335,971) |
Treasury, Balance as of end of period (in shares) |  | (194,335,971) |
Treasury Stock | Shares issued under LTIPs |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |
Shares issued under LTIPs (in shares) |  | 0 |

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