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 |