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Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 09, 2023 | Jan. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Preferred shares, balance beginning (in shares) |  | 650,000 |  | 0 |  |
Preferred shares, outstanding, beginning balance (in shares) |  | 650,000 |  | 0 |  |
Preferred shares, balance as of end of period (in shares) |  |  | 650,000 | 650,000 | 0 |
Preferred shares, outstanding , ending balance (in shares) |  |  | 650,000 | 650,000 | 0 |
Beginning balance, common shares issued (in shares) |  | 267,330,470 |  | 423,897,001 |  |
Beginning balance, treasury shares (in shares) |  | (59,199,520) |  | (194,335,971) |  |
Beginning balance, common shares outstanding (in shares) |  | 208,130,950 |  | 229,561,030 | 243,753,899 | 244,231,933
Share repurchases (in shares) |  |  |  | (22,730,940) | (14,685,521) | (1,084,752)
Retirement of treasury stock (in shares) |  |  | 157,676,142 | 0 |  |
Ending balance, common shares issued (in shares) |  |  | 267,330,470 | 267,330,470 | 423,897,001 |
Ending balance, treasury shares (in shares) |  |  | (59,199,520) | (59,199,520) | (194,335,971) |
Ending balance, common shares outstanding (in shares) |  |  | 208,130,950 | 208,130,950 | 229,561,030 | 243,753,899
Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Share repurchases (in shares) |  | (770,205) |  |  |  |
Ending balance, common shares outstanding (in shares) |  | 208,021,012 |  |  |  |
Long-term Incentive Plan |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  |  |  | 1,109,611 | 349,827 | 489,326
Long-term Incentive Plan | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  | 660,267 |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under ESPP (in shares) |  |  |  | 191,249 | 142,825 | 117,392
Preferred Stock |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Preferred shares, balance beginning (in shares) |  | 650,000 |  |  |  |
Preferred shares, outstanding, beginning balance (in shares) |  | 650,000 |  |  |  |
Preferred shares, balance as of end of period (in shares) |  |  | 650,000 | 650,000 |  |
Preferred shares, outstanding , ending balance (in shares) |  |  | 650,000 | 650,000 |  |
Preferred Stock | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Preferred shares, balance as of end of period (in shares) |  | 650,000 |  |  |  |
Preferred shares, outstanding , ending balance (in shares) |  | 650,000 |  |  |  |
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] |  |  |  |  |  |
Beginning balance, common shares issued (in shares) |  | 267,330,470 |  | 423,897,001 | 423,547,174 | 423,057,848
Beginning balance, common shares outstanding (in shares) |  | 208,130,950 |  |  |  |
Retirement of treasury stock (in shares) |  |  |  |  | (157,676,142) |
Ending balance, common shares issued (in shares) |  |  | 267,330,470 | 267,330,470 | 423,897,001 | 423,547,174
Ending balance, common shares outstanding (in shares) |  |  | 208,130,950 | 208,130,950 |  |
Common Stock | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  | 660,267 |  |  |  |
Retirement of treasury stock (in shares) |  | (770,205) |  |  |  |
Ending balance, common shares issued (in shares) |  | 267,220,532 |  |  |  |
Common Stock | Long-term Incentive Plan |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  |  |  | 1,109,611 | 349,827 | 489,326
Treasury Stock |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, treasury shares (in shares) |  | (59,199,520) |  | (194,335,971) | (179,793,275) | (178,825,915)
Shares issued under ESPP (in shares) |  |  |  | 191,249 | 142,825 | 117,392
Share repurchases (in shares) |  |  |  | (22,730,940) | (14,685,521) | (1,084,752)
Retirement of treasury stock (in shares) |  |  |  | 157,676,142 |  |
Ending balance, treasury shares (in shares) |  |  | (59,199,520) | (59,199,520) | (194,335,971) | (179,793,275)
Treasury Stock | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  | 0 |  |  |  |
Share repurchases (in shares) |  | (770,205) |  |  |  |
Retirement of treasury stock (in shares) |  | 770,205 |  |  |  |
Ending balance, treasury shares (in shares) |  | (59,199,520) |  |  |  |
Treasury Stock | Long-term Incentive Plan |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  |  |  | 0 | 0 | 0

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