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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares
3 Months Ended 12 Months Ended
Oct. 20, 2022
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
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 $ 0.35 $ 0.325 $ 0.325 $ 0.325  
Subsequent Event                  
Subsequent Event [Line Items]                  
Common stock dividends declared (in usd per share) $ 0.35                
Subsequent Event | Forecast                  
Subsequent Event [Line Items]                  
Common stock dividends proposed annual amount (in usd per share)   $ 1.51              
Annual dividends increase percentage   8.00%              
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%