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% |