Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jul. 22, 2026 |
Jun. 30, 2026 |
Mar. 31, 2026 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2026 |
|
| Subsequent Event [Line Items] | ||||||
| Common stock proposed annual dividend (in usd per share) | $ 1.90 | |||||
| Common stock dividends declared (in usd per share) | 1.76 | |||||
| Dividends per common share (in usd per share) | $ 0.475 | $ 0.475 | $ 0.440 | $ 0.440 | ||
| Subsequent Event | ||||||
| Subsequent Event [Line Items] | ||||||
| Common stock dividends declared (in usd per share) | $ 0.475 | |||||
| Minimum | ||||||
| Subsequent Event [Line Items] | ||||||
| Common stock, annual dividend growth rate, percentage | 7.00% | |||||
| Maximum | ||||||
| Subsequent Event [Line Items] | ||||||
| Common stock, annual dividend growth rate, percentage | 9.00% | |||||