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v3.22.1

Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 20, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2021
Subsequent Event [Line Items] |  |  |  |  |
Common stock dividends proposed annual amount (in usd per share) |  | $ 1.40 |  |  | $ 1.30
Dividends per common share (in usd per share) |  | $ 0.35 | $ 0.35 | $ 0.325 |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock dividends declared (in usd per share) | $ 0.35 |  |  |  |
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% |  |  |

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