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Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 09, 2023 | Feb. 01, 2025 | Jan. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Preferred shares, issued balance beginning (in shares) |  | 650,000 | 650,000 | 650,000 |  |
Preferred shares, outstanding, beginning balance (in shares) |  | 650,000 | 650,000 | 650,000 |  |
Preferred shares, issued balance as of end of period (in shares) |  |  |  | 650,000 | 650,000 |
Preferred shares, outstanding , ending balance (in shares) |  |  |  | 650,000 | 650,000 |
Beginning balance, common shares issued (in shares) |  | 205,064,058 | 205,064,058 | 267,330,470 |  |
Beginning balance, treasury shares (in shares) |  | (6,460,055) | (6,460,055) | (59,199,520) |  |
Beginning balance, common shares outstanding (in shares) |  | 198,604,003 | 198,604,003 | 208,130,950 | 229,561,030 | 243,753,899
Total number of shares purchased (in shares) |  |  |  | 11,725,563 | 22,730,940 | 14,685,521
Partial settlement of Capped Call Options (in shares) |  |  |  | (2,588) |  |
Ending balance, common shares issued (in shares) |  |  |  | 205,064,058 | 267,330,470 |
Ending balance, treasury shares (in shares) |  |  |  | (6,460,055) | (59,199,520) |
Ending balance, common shares outstanding (in shares) |  |  |  | 198,604,003 | 208,130,950 | 229,561,030
Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Total number of shares purchased (in shares) |  | 1,076,423 | 1,076,423 |  |  |
Ending balance, common shares outstanding (in shares) |  | 198,068,576 |  |  |  |
Long-term Incentive Plan |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  |  |  | 1,959,134 | 1,109,611 | 349,827
Long-term Incentive Plan | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  | 540,996 |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, common shares outstanding (in shares) |  |  |  | 208,130,950 |  |
Shares issued under ESPP (in shares) |  |  |  | 242,070 | 191,249 | 142,825
Ending balance, common shares outstanding (in shares) |  |  |  |  | 208,130,950 |
Preferred Stock |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Preferred shares, outstanding, beginning balance (in shares) |  | 650,000 | 650,000 |  |  |
Preferred shares, outstanding , ending balance (in shares) |  |  |  | 650,000 |  |
Preferred Stock | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Preferred shares, issued 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) |  | 205,064,058 | 205,064,058 | 267,330,470 | 423,897,001 | 423,547,174
Beginning balance, common shares outstanding (in shares) |  | 198,604,003 | 198,604,003 |  |  |
Retirement of treasury stock (in shares) |  |  |  | (64,225,546) | (157,676,142) |
Ending balance, common shares issued (in shares) |  |  |  | 205,064,058 | 267,330,470 | 423,897,001
Ending balance, common shares outstanding (in shares) |  |  |  | 198,604,003 |  |
Common Stock | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Retirement of treasury stock (in shares) |  | (1,028,193) |  |  |  |
Ending balance, common shares issued (in shares) |  | 204,576,861 |  |  |  |
Common Stock | Long-term Incentive Plan |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  |  |  | 1,959,134 | 1,109,611 | 349,827
Common Stock | Long-term Incentive Plan | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Shares issued under LTIPs (in shares) |  | 540,996 |  |  |  |
Treasury Stock |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, treasury shares (in shares) |  | (6,460,055) | (6,460,055) | (59,199,520) | (194,335,971) | (179,793,275)
Shares issued under ESPP (in shares) |  |  |  | 242,070 | 191,249 | 142,825
Total number of shares purchased (in shares) |  |  |  | 11,725,563 | 22,730,940 | 14,685,521
Partial settlement of Capped Call Options (in shares) |  |  |  | (2,588) |  |
Retirement of treasury stock (in shares) |  |  |  | 64,225,546 | 157,676,142 |
Ending balance, treasury shares (in shares) |  |  |  | (6,460,055) | (59,199,520) | (194,335,971)
Treasury Stock | Subsequent Event |  |  |  |  |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |  |  |  |  |
Total number of shares purchased (in shares) |  | 1,076,423 |  |  |  |
Retirement of treasury stock (in shares) |  | 1,028,193 |  |  |  |
Ending balance, treasury shares (in shares) |  | (6,508,285) |  |  |  |

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