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Changes in Capital Structure - NRG Common Stock Dividends Paid (Details) - $ / shares
3 Months Ended
May 15, 2019
Apr. 08, 2019
Mar. 31, 2019
Mar. 31, 2018
Dividends [Abstract]        
Dividends Per Common Share (in usd per share)     $ 0.03 $ 0.03
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