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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares
3 Months Ended 12 Months Ended
Jul. 20, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 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 $ 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%