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Changes in Capital Structure - NRG Common Stock Dividends Paid (Details) - $ / shares
3 Months Ended 6 Months Ended
Aug. 01, 2019
Jul. 19, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Subsequent Event [Line Items]            
Dividends Per Common Share (in usd per share)     $ 0.03 $ 0.03 $ 0.06 $ 0.06
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