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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
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
Operating Revenues                        
Total operating revenues   $ 2,195 $ 2,996 $ 2,465 $ 2,165 $ 1,992 $ 2,960 $ 2,461 $ 2,065 $ 9,821 $ 9,478 $ 9,074
Operating Costs and Expenses                        
Cost of operations                   7,303 7,108 6,886
Depreciation and amortization                   373 421 596
Impairment losses                   5 99 1,534
Selling, general and administrative                   827 799 836
Reorganization costs                   23 90 44
Development costs                   7 11 22
Total operating costs and expenses                   8,538 8,528 9,918
Other income - affiliate $ 84                 0 0 87
Gain on sale of assets                   7 32 16
Operating Income/(Loss)   209 540 320 221 49 398 174 361 1,290 982 (741)
Other Income/(Expense)                        
Equity in earnings/(losses) of unconsolidated affiliates                   2 9 (14)
Impairment losses on investments                   (108) (15) (79)
Other income, net                   66 18 51
Loss on debt extinguishment, net                   (51) (44) (49)
Interest expense                   (413) (483) (557)
Total other expense                   (504) (515) (648)
Income/(Loss) from Continuing Operations Before Income Taxes                   786 467 (1,389)
Income tax (benefit)/expense                   (3,334) 7 (44)
Income/(Loss) from Continuing Operations   3,463 374 189 94 (93) 287 27 238 4,120 460 (1,345)
Income/(loss) from discontinued operations, net of income tax   (78) (2) 13 388 80 (336) 69 (5) 321 (192) (992)
Net Income/(Loss)   3,385 372 202 482 (13) (49) 96 233 4,441 268 (2,337)
Less: Net income/(loss) attributable to noncontrolling interest and redeemable interests   $ 2 $ 0 $ 1 $ 0 $ (2) $ 23 $ 24 $ (46) 3 0 (184)
Net Income/(Loss) Attributable to NRG Energy, Inc.                   $ 4,438 $ 268 $ (2,153)
Earnings/(Loss) Per Share Attributable to NRG Energy, Inc. Common Stockholders                        
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) from continuing operations per weighted average common share —basic (in usd per share)                   $ 15.71 $ 1.51 $ (3.66)
Income/(loss) from discontinued operations per weighted average common share — basic (in usd per share)   $ (0.31) $ (0.01) $ 0.05 $ 1.39 $ 0.28 $ (1.12) $ 0.22 $ (0.02) 1.23 (0.63) (3.13)
Net 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)
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) from continuing operations per weighted average common share — diluted (in usd per share)                   $ 15.59 $ 1.49 $ (3.66)
Income/(loss) from discontinued operations per weighted average common share — diluted (in usd per share)   $ (0.31) $ (0.01) $ 0.05 $ 1.38 $ 0.28 $ (1.12) $ 0.22 $ (0.02) 1.22 (0.62) (3.13)
Net 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)