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Earnings /Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic income/(loss) per share attributable to NRG, Inc;                      
Net Income/(Loss) Attributable to NRG Energy, Inc.                 $ 4,438 $ 268 $ (2,153)
Weighted average number of common shares outstanding — basic (in shares) 251,000,000 254,000,000 265,000,000 278,000,000 289,000,000 299,000,000 310,000,000 318,000,000 262,000,000 304,000,000 317,000,000
Income/(Loss) per weighted average common share — basic (in usd per share) $ 13.48 $ 1.46 $ 0.76 $ 1.73 $ (0.04) $ (0.24) $ 0.23 $ 0.88 $ 16.94 $ 0.88 $ (6.79)
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares)                 2,000,000 4,000,000 0
Weighted average number of common shares outstanding — diluted (in shares) 253,000,000 256,000,000 267,000,000 280,000,000 289,000,000 299,000,000 314,000,000 322,000,000 264,000,000 308,000,000 317,000,000
Income (Loss) per weighted average common share — diluted (in usd per share) $ 13.37 $ 1.45 $ 0.75 $ 1.72 $ (0.04) $ (0.24) $ 0.23 $ 0.87 $ 16.81 $ 0.87 $ (6.79)