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Segment Reporting (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) MW | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) MW | Jun. 30, 2017 USD ($) | Mar. 30, 2018 MW | Dec. 31, 2017 USD ($) MW
Segment Reporting Information |  |  |  |  |  |
Generation capacity (in MW) | MW | 30,000 |  | 30,000 |  |  |
Operating revenues | $ 2,922 | $ 2,701 | $ 5,343 | $ 5,083 |  |
Depreciation and amortization | 227 | 260 | 462 | 517 |  |
Impairment losses | 74 | 63 | 74 | 63 |  |
Reorganization costs | 23 | 0 | 43 | 0 |  |
Equity in earnings/(losses) of unconsolidated affiliates | 18 | (3) | 16 | 2 |  |
(Loss)/income from continuing operations before income taxes | 129 | 103 | 361 | (71) |  |
(Loss)/income from continuing operations | 121 | 99 | 354 | (70) |  |
Loss from discontinued operations, net of income tax | (25) | (741) | (25) | (775) |  |
Net Income/(Loss) | 96 | (642) | 329 | (845) |  |
Net income/(loss) attributable to NRG Energy, Inc. | 72 | (626) | 351 | (790) |  |
Total assets | 22,947 |  | 22,947 |  |  | $ 23,318
Eliminations |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | (540) | (194) | (240) | (436) |  |
Depreciation and amortization | 0 | 0 | 0 | 0 |  |
Impairment losses | 0 | 0 | 0 | 0 |  |
Reorganization costs | 0 |  | 0 |  |  |
Equity in earnings/(losses) of unconsolidated affiliates | (16) | (5) | (23) | (9) |  |
(Loss)/income from continuing operations before income taxes | (12) | (5) | (22) | (9) |  |
(Loss)/income from continuing operations | (12) | (5) | (22) | (9) |  |
Loss from discontinued operations, net of income tax | 0 | 0 | 0 | 0 |  |
Net Income/(Loss) | (12) | (5) | (22) | (9) |  |
Net income/(loss) attributable to NRG Energy, Inc. | 94 | 25 | 96 | 18 |  |
Total assets | (10,816) |  | (10,816) |  |  |
Retail | Operating Segments |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | 1,817 | 1,603 | 3,298 | 2,938 |  |
Depreciation and amortization | 31 | 29 | 59 | 57 |  |
Impairment losses | 0 | 0 | 0 | 0 |  |
Reorganization costs | 1 |  | 4 |  |  |
Equity in earnings/(losses) of unconsolidated affiliates | 0 | 0 | 0 | 0 |  |
(Loss)/income from continuing operations before income taxes | (84) | 330 | 861 | 303 |  |
(Loss)/income from continuing operations | (84) | 341 | 861 | 311 |  |
Loss from discontinued operations, net of income tax | 0 | 0 | 0 | 0 |  |
Net Income/(Loss) | (84) | 341 | 861 | 311 |  |
Net income/(loss) attributable to NRG Energy, Inc. | (88) | 341 | 851 | 311 |  |
Total assets | 7,217 |  | 7,217 |  |  |
Retail | Eliminations |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | (2) | (1) | (3) | (11) |  |
Generation | Operating Segments |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | 1,218 | 882 | 1,545 | 1,848 |  |
Depreciation and amortization | 66 | 95 | 133 | 192 |  |
Impairment losses | 74 | 41 | 74 | 41 |  |
Reorganization costs | 3 |  | 7 |  |  |
Equity in earnings/(losses) of unconsolidated affiliates | 0 | (15) | 2 | (28) |  |
(Loss)/income from continuing operations before income taxes | 273 | (89) | (264) | (52) |  |
(Loss)/income from continuing operations | 272 | (90) | (265) | (54) |  |
Loss from discontinued operations, net of income tax | 0 | 0 | 0 | 0 |  |
Net Income/(Loss) | 272 | (90) | (265) | (54) |  |
Net income/(loss) attributable to NRG Energy, Inc. | 272 | (90) | (265) | (54) |  |
Total assets | 4,306 |  | 4,306 |  |  |
Generation | Eliminations |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | (546) | (171) | (239) | (406) |  |
Renewables |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Impairment losses |  | 22 |  |  |  |
Renewables | Operating Segments |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | 113 | 119 | 199 | 213 |  |
Depreciation and amortization | 40 | 49 | 90 | 96 |  |
Impairment losses | 0 | 22 | 0 | 22 |  |
Reorganization costs | 3 |  | 3 |  |  |
Equity in earnings/(losses) of unconsolidated affiliates | 5 | (2) | 5 | (3) |  |
(Loss)/income from continuing operations before income taxes | (17) | (51) | (56) | (87) |  |
(Loss)/income from continuing operations | (12) | (46) | (45) | (77) |  |
Loss from discontinued operations, net of income tax | 0 | 0 | 0 | 0 |  |
Net Income/(Loss) | (12) | (46) | (45) | (77) |  |
Net income/(loss) attributable to NRG Energy, Inc. | (35) | (21) | (33) | (24) |  |
Total assets | 4,117 |  | 4,117 |  |  |
Renewables | Eliminations |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | (9) | (3) | (17) | (4) |  |
NRG Yield | Operating Segments |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | 307 | 288 | 532 | 509 |  |
Depreciation and amortization | 82 | 79 | 163 | 156 |  |
Impairment losses | 0 | 0 | 0 | 0 |  |
Reorganization costs | 0 |  | 0 |  |  |
Equity in earnings/(losses) of unconsolidated affiliates | 29 | 16 | 33 | 35 |  |
(Loss)/income from continuing operations before income taxes | 103 | 52 | 102 | 49 |  |
(Loss)/income from continuing operations | 96 | 44 | 96 | 42 |  |
Loss from discontinued operations, net of income tax | 0 | 0 | 0 | 0 |  |
Net Income/(Loss) | 96 | 44 | 96 | 42 |  |
Net income/(loss) attributable to NRG Energy, Inc. | 73 | 38 | 94 | 50 |  |
Total assets | 8,448 |  | 8,448 |  |  |
NRG Yield | Eliminations |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | 0 | 0 | 0 | 0 |  |
Corporate | Operating Segments |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | 7 | 3 | 9 | 11 |  |
Depreciation and amortization | 8 | 8 | 17 | 16 |  |
Impairment losses | 0 | 0 | 0 | 0 |  |
Reorganization costs | 16 |  | 29 |  |  |
Equity in earnings/(losses) of unconsolidated affiliates | 0 | 3 | (1) | 7 |  |
(Loss)/income from continuing operations before income taxes | (134) | (134) | (260) | (275) |  |
(Loss)/income from continuing operations | (139) | (145) | (271) | (283) |  |
Loss from discontinued operations, net of income tax | (25) | (741) | (25) | (775) |  |
Net Income/(Loss) | (164) | (886) | (296) | (1,058) |  |
Net income/(loss) attributable to NRG Energy, Inc. | (244) | (919) | (392) | (1,091) |  |
Total assets | 9,675 |  | 9,675 |  |  |
Corporate | Eliminations |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Operating revenues | $ 17 | $ (19) | $ 19 | $ (15) |  |
Buckthorn Renewables, LLC |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  | 154 |
Discontinued Operations, Held-for-sale or Disposed of by Sale | Buckthorn Renewables, LLC |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Percentage of ownership sold |  |  |  |  | 100.00% |
NRG Yield |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  |  | 555

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