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Changes in Capital Structure - NRG Common Stock Dividends Paid (Details) - $ / shares
3 Months Ended
Nov. 01, 2019
Oct. 17, 2019
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Subsequent Event [Line Items]                  
Dividends Per Common Share (in usd per share)       $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03
Forecast                  
Subsequent Event [Line Items]                  
Common stock dividends proposed annual amount (in usd per share)     $ 1.20            
Forecast | Minimum                  
Subsequent Event [Line Items]                  
Common stock, annual dividend growth rate, percentage     7.00%            
Forecast | Maximum                  
Subsequent Event [Line Items]                  
Common stock, annual dividend growth rate, percentage     9.00%            
Subsequent Event                  
Subsequent Event [Line Items]                  
Common stock dividends declared (in usd per share)   $ 0.03              
Common stock dividends proposed annual amount (in usd per share) $ 0.12