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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares
3 Months Ended 12 Months Ended
Apr. 17, 2024
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Subsequent Event [Line Items]        
Common stock dividends proposed annual amount (in usd per share)   $ 1.51   $ 1.63
Dividends per common share (in usd per share)   $ 0.4075 $ 0.3775  
Subsequent Event        
Subsequent Event [Line Items]        
Common stock dividends declared (in usd per share) $ 0.4075      
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%