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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares
3 Months Ended 12 Months Ended
Oct. 23, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Subsequent Event [Line Items]                
Common stock dividends proposed annual amount (in usd per share)       $ 1.20       $ 0.12
Dividends per common share (in usd per share)   $ 0.30 $ 0.30 $ 0.30 $ 0.03 $ 0.03 $ 0.03  
Subsequent Event                
Subsequent Event [Line Items]                
Common stock dividends declared (in usd per share) $ 0.30              
Minimum                
Subsequent Event [Line Items]                
Common stock, annual dividend growth rate, percentage       700.00%        
Maximum                
Subsequent Event [Line Items]                
Common stock, annual dividend growth rate, percentage       9.00%