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Unaudited Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 1,992 $ 2,960 $ 2,461 $ 2,065 $ 2,154 $ 2,618 $ 2,281 $ 2,021 $ 9,478 $ 9,074 $ 8,915
Operating income 49 398 174 361 (1,200) 275 214 (30) 982 (741) 33
Net (loss)/income from continuing operations (93) 288 27 238 (1,390) 163 60 (178) 460 (1,345) (956)
(Loss)/income from discontinued operations, net of income tax 80 (336) 69 (5) (265) 0 (702) (25) (192) (992) 65
Net Income/(Loss) (13) (48) 96 233 (1,655) 163 (642) (203) 268 (2,337) (891)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests (2) 24 24 (46) (120) (8) (16) (40) 0 (184) (117)
Net (loss)/income attributable to NRG Energy, Inc.                 268 (2,153) (774)
(Loss)/income available to Common Stockholders $ (11) $ (72) $ 72 $ 279 $ (1,535) $ 171 $ (626) $ (163) $ 268 $ (2,153) $ (701)
Weighted average number of common shares outstanding — basic (in shares) 289,000,000 299,000,000 310,000,000 318,000,000 317,000,000 317,000,000 316,000,000 316,000,000 304,000,000 317,000,000 316,000,000
Income/(loss) from discontinued operations per weighted average common share — basic (in usd per share) $ 0.28 $ (1.12) $ 0.22 $ (0.02) $ (0.84) $ 0.00 $ (2.22) $ (0.08) $ (0.63) $ (3.13) $ 0.20
Income/(Loss) per weighted average common share — basic (in usd per share) $ (0.04) $ (0.24) $ 0.23 $ 0.88 $ (4.84) $ 0.54 $ (1.98) $ (0.52) $ 0.88 $ (6.79) $ (2.22)
Weighted average number of common shares outstanding — diluted (in shares) 289,000,000 299,000,000 314,000,000 322,000,000 317,000,000 322,000,000 316,000,000 316,000,000 308,000,000 317,000,000 316,000,000
Income/(loss) from discontinued operations per weighted average common share — diluted (in usd per share) $ 0.28 $ (1.12) $ 0.22 $ (0.02) $ (0.84) $ 0.00 $ (2.22) $ (0.08) $ (0.62) $ (3.13) $ 0.20
Net (loss)/income per weighted average common share — diluted (in usd per share) $ (0.04) $ (0.24) $ 0.23 $ 0.87 $ (4.84) $ 0.53 $ (1.98) $ (0.52) $ 0.87 $ (6.79) $ (2.22)