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v3.24.3

Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2024 | Sep. 30, 2024
Schedule of Stock by Class, Equity [Roll Forward] |  |
Preferred, Balance as of beginning of period (in shares) | 650,000 | 650,000
Preferred, Balance as of end of period (in shares) |  | 650,000
Common, Balance as of beginning of period (in shares) | 264,056,285 | 267,330,470
Treasury, Balance as of beginning of period (in shares) | (59,126,958) | (59,199,520)
Common, Outstanding, as of beginning of period (in shares) | 204,929,327 | 208,130,950
Shares repurchased (in shares) |  | (5,181,424)
Partial settlement of Capped Call Options (in shares) |  | (2,588)
Common, Balance as of end of period (in shares) |  | 264,056,285
Treasury, Balance as of end of period (in shares) |  | (59,126,958)
Common, Outstanding, as of end of period (in shares) |  | 204,929,327
Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares repurchased (in shares) | (2,524,323) |
Common, Outstanding, as of end of period (in shares) | 202,566,373 |
Shares issued under LTIPs |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) |  | 1,836,827
Shares issued under LTIPs | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) | 64,861 |
Shares issued under ESPP |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under ESPP (in shares) |  | 145,562
Shares issued under ESPP | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under ESPP (in shares) | 96,508 |
Preferred Stock |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Preferred, Balance as of beginning of period (in shares) | 650,000 | 650,000
Preferred, Balance as of end of period (in shares) |  | 650,000
Preferred Stock | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Preferred, Balance as of end of period (in shares) | 650,000 |
Common Stock |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Common, Balance as of beginning of period (in shares) | 264,056,285 | 267,330,470
Partial settlement of Capped Call Options (in shares) |  | 0
Retirement of treasury stock (in shares) |  | (5,111,012)
Common, Balance as of end of period (in shares) |  | 264,056,285
Common Stock | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Retirement of treasury stock (in shares) | (2,064,950) |
Common, Balance as of end of period (in shares) | 262,056,196 |
Common Stock | Shares issued under LTIPs |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) |  | 1,836,827
Common Stock | Shares issued under LTIPs | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) | 64,861 |
Common Stock | Shares issued under ESPP | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under ESPP (in shares) | 0 |
Treasury Stock |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Treasury, Balance as of beginning of period (in shares) | (59,126,958) | (59,199,520)
Shares repurchased (in shares) |  | (5,181,424)
Partial settlement of Capped Call Options (in shares) |  | (2,588)
Retirement of treasury stock (in shares) |  | 5,111,012
Treasury, Balance as of end of period (in shares) |  | (59,126,958)
Treasury Stock | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares repurchased (in shares) | (2,524,323) |
Retirement of treasury stock (in shares) | 2,064,950 |
Treasury, Balance as of end of period (in shares) | (59,489,823) |
Treasury Stock | Shares issued under LTIPs | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) | 0 |
Treasury Stock | Shares issued under ESPP |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under ESPP (in shares) |  | 145,562
Treasury Stock | Shares issued under ESPP | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under ESPP (in shares) | 96,508 |

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