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Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2024 | Mar. 31, 2024
Schedule of Stock by Class, Equity [Roll Forward] |  |
Preferred, Balance as of beginning of period (in shares) | 650,000 |
Preferred, Balance as of end of period (in shares) |  | 650,000
Common, Balance as of beginning of period (in shares) | 267,365,782 | 267,330,470
Treasury, Balance as of beginning of period (in shares) | (59,199,520) | (59,199,520)
Common, Outstanding, as of beginning of period (in shares) | 208,166,262 | 208,130,950
Shares repurchased (in shares) |  | (1,163,230)
Retirement of treasury stock (in shares) |  | 1,163,230
Common, Balance as of end of period (in shares) |  | 267,365,782
Treasury, Balance as of end of period (in shares) |  | (59,199,520)
Common, Outstanding, as of end of period (in shares) |  | 208,166,262
Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Common, Outstanding, as of end of period (in shares) | 208,475,647 |
Shares issued under LTIPs |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) |  | 1,198,542
Shares issued under LTIPs | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) | 163,823 |
Shares issued under ESPP | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under ESPP (in shares) | 145,562 |
Preferred Stock |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Preferred, Balance as of beginning of period (in shares) | 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) | 267,365,782 | 267,330,470
Shares repurchased (in shares) |  | 0
Retirement of treasury stock (in shares) |  | (1,163,230)
Common, Balance as of end of period (in shares) |  | 267,365,782
Common Stock | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Common, Balance as of end of period (in shares) | 267,529,605 |
Common Stock | Shares issued under LTIPs |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) |  | 1,198,542
Common Stock | Shares issued under LTIPs | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) | 163,823 |
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) | (59,199,520) | (59,199,520)
Shares repurchased (in shares) |  | (1,163,230)
Retirement of treasury stock (in shares) |  | 1,163,230
Treasury, Balance as of end of period (in shares) |  | (59,199,520)
Treasury Stock | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Treasury, Balance as of end of period (in shares) | (59,053,958) |
Treasury Stock | Shares issued under LTIPs |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under LTIPs (in shares) |  | 0
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 | Subsequent Event |  |
Schedule of Stock by Class, Equity [Roll Forward] |  |
Shares issued under ESPP (in shares) | 145,562 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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