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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares
3 Months Ended 12 Months Ended
Oct. 11, 2024
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2023
Subsequent Event [Line Items]                  
Common stock dividends proposed annual amount (in usd per share)         $ 1.63       $ 1.51
Dividends per common share (in usd per share)     $ 0.4075 $ 0.4075 $ 0.4075 $ 0.3775 $ 0.3775 $ 0.3775  
Subsequent Event                  
Subsequent Event [Line Items]                  
Common stock dividends declared (in usd per share) $ 0.4075                
Subsequent Event | Forecast                  
Subsequent Event [Line Items]                  
Common stock dividends proposed annual amount (in usd per share)   $ 1.76              
Common stock, annual dividend increase   8.00%              
Minimum | Subsequent Event | Forecast                  
Subsequent Event [Line Items]                  
Common stock, annual dividend growth rate, percentage   7.00%              
Maximum | Subsequent Event | Forecast                  
Subsequent Event [Line Items]                  
Common stock, annual dividend growth rate, percentage   9.00%