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Segment Reporting | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Reporting | Segment Reporting The Company's segment structure reflects how management currently makes financial decisions and allocates resources. The Company's businesses are segregated as follows: Generation, which includes generation, international and BETM; Retail, which includes Mass customers and Business Solutions, which includes C&I customers and other distributed and reliability products; Renewables, which includes solar and wind assets, excluding those in NRG Yield; NRG Yield; and corporate activities. Intersegment sales are accounted for at market. NRG Yield includes certain of the Company's contracted generation assets. During 2017, NRG Yield acquired several projects totaling 555 MW for cash consideration of approximately $245 million from NRG. These acquisitions were treated as a transfer of entities under common control and accordingly, the financial information for years ended December 31, 2017, 2016, and 2015 have been recast to reflect these changes. On June 14, 2017, as described in Note 3, Discontinued Operations, Acquisitions and Dispositions, NRG deconsolidated GenOn for financial reporting purposes. The financial information for years ended December 31, 2017, 2016, and 2015 have been recast to present GenOn as discontinued operations within the corporate segment. NRG’s chief operating decision maker, its chief executive officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, free cash flow and capital for allocation, as well as net income/(loss) and net income/(loss) attributable to NRG Energy, Inc. During the years ended December 31, 2017, 2016 and 2015, the Company had no customer which comprised more than 10% of the Company's consolidated revenues.
| For the Year Ended December 31, 2017
| Generation(a) |  | Retail (a) |  | Renewables(a) |  | NRG Yield(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 3,773 |  |  | $ | 6,380 |  |  | $ | 424 |  |  | $ | 1,009 |  |  | $ | 14 |  |  | $ | (971 | ) |  |  | $ | 10,629 |
Operating expenses | 3,300 |  |  | 5,372 |  |  | 211 |  |  | 348 |  |  | 220 |  |  | (964 | ) |  |  | 8,487 |
Depreciation and amortization | 377 |  |  | 117 |  |  | 196 |  |  | 334 |  |  | 32 |  |  | — |  |  |  | 1,056 |
Impairment losses | 1,504 |  |  | 7 |  |  | 154 |  |  | 44 |  |  | — |  |  | — |  |  |  | 1,709 |
Development costs | 13 |  |  | 2 |  |  | 45 |  |  | — |  |  | 7 |  |  | — |  |  |  | 67 |
Total operating cost and expenses | 5,194 |  |  | 5,498 |  |  | 606 |  |  | 726 |  |  | 259 |  |  | (964 | ) |  |  | 11,319 |
Other income - affiliate | — |  |  | — |  |  | — |  |  | — |  |  | 87 |  |  | — |  |  |  | 87 |
Gain/(loss) on sale of assets | 20 |  |  | — |  |  | (5 | ) |  | — |  |  | 1 |  |  | — |  |  |  | 16 |
Operating (loss)/income | (1,401 | ) |  | 882 |  |  | (187 | ) |  | 283 |  |  | (157 | ) |  | (7 | ) |  |  | (587 | )
Equity in (losses)/earnings of unconsolidated affiliates | (14 | ) |  | — |  |  | — |  |  | 71 |  |  | 6 |  |  | (32 | ) |  |  | 31 |
Impairment losses on investments | (74 | ) |  | — |  |  | — |  |  | — |  |  | (5 | ) |  | — |  |  |  | (79 | )
Other income, net | 22 |  |  | 1 |  |  | — |  |  | 4 |  |  | 11 |  |  | — |  |  |  | 38 |
Loss on debt extinguishment | — |  |  | — |  |  | (1 | ) |  | (3 | ) |  | (49 | ) |  | — |  |  |  | (53 | )
Interest expense | (29 | ) |  | (6 | ) |  | (98 | ) |  | (306 | ) |  | (451 | ) |  | — |  |  |  | (890 | )
(Loss)/income from continuing operations before income taxes | (1,496 | ) |  | 877 |  |  | (286 | ) |  | 49 |  |  | (645 | ) |  | (39 | ) |  |  | (1,540 | )
Income tax expense/(benefit) | 2 |  |  | (9 | ) |  | (20 | ) |  | 72 |  |  | (37 | ) |  | — |  |  |  | 8 |
Net (loss)/income from continuing operations | $ | (1,498 | ) |  | $ | 886 |  |  | $ | (266 | ) |  | $ | (23 | ) |  | $ | (608 | ) |  | $ | (39 | ) |  |  | $ | (1,548 | )
Loss from discontinued operations, net of income tax | — |  |  | — |  |  | — |  |  | — |  |  | (789 | ) |  | — |  |  |  | $ | (789 | )
Net (Loss)/Income | (1,498 | ) |  | 886 |  |  | (266 | ) |  | (23 | ) |  | (1,397 | ) |  | (39 | ) |  |  | (2,337 | )
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests | — |  |  | 2 |  |  | (103 | ) |  | (87 | ) |  | (4 | ) |  | 8 |  |  |  | (184 | )
Net (loss)/income attributable to NRG Energy, Inc. | $ | (1,498 | ) |  | $ | 884 |  |  | $ | (163 | ) |  | $ | 64 |  |  | $ | (1,393 | ) |  | $ | (47 | ) |  |  | $ | (2,153 | )
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | $ | 179 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 852 |  |  | $ | 3 |  |  | $ | — |  |  |  | $ | 1,038 |
Capital expenditures (b) | 481 |  |  | 82 |  |  | 521 |  |  | 31 |  |  | 12 |  |  | — |  |  | 1,127 |
Goodwill | 165 |  |  | 374 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 539 |
Total assets | $ | 7,209 |  |  | $ | 2,630 |  |  | $ | 5,129 |  |  | $ | 8,283 |  |  | $ | 8,919 |  |  | $ | (8,852 | ) | — |  | $ | 23,318 |
(a) Inter-segment sales and net derivative gains and losses included in operating revenues | $ | 910 |  |  | $ | 5 |  |  | $ | 31 |  |  | $ | — |  |  | $ | 25 |  |  | $ | — |  |  | $ | 971 |
(b) Includes accruals.
| For the Year Ended December 31, 2016
| Generation(a) |  | Retail (a) |  | Renewables(a) |  | NRG Yield(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 3,833 |  |  | $ | 6,335 |  |  | $ | 406 |  |  | $ | 1,035 |  |  | $ | 77 |  |  | $ | (1,174 | ) |  | $ | 10,512 |
Operating expenses | 3,545 |  |  | 5,164 |  |  | 217 |  |  | 325 |  |  | 323 |  |  | (1,178 | ) |  | 8,396 |
Depreciation and amortization | 516 |  |  | 111 |  |  | 185 |  |  | 303 |  |  | 57 |  |  | — |  |  | 1,172 |
Impairment losses | 430 |  |  | 1 |  |  | 54 |  |  | 185 |  |  | 32 |  |  | — |  |  | 702 |
Development costs | 15 |  |  | 4 |  |  | 40 |  |  | — |  |  | 30 |  |  | — |  |  | 89 |
Total operating cost and expenses | 4,506 |  |  | 5,280 |  |  | 496 |  |  | 813 |  |  | 442 |  |  | (1,178 | ) |  | 10,359 |
Other income - affiliate | — |  |  | — |  |  | — |  |  | — |  |  | 193 |  |  | — |  |  | 193 |
Loss on sale of assets | — |  |  | (1 | ) |  | — |  |  | — |  |  | (79 | ) |  |  |  |  | (80 | )
Operating (loss)/income | (673 | ) |  | 1,054 |  |  | (90 | ) |  | 222 |  |  | (251 | ) |  | 4 |  |  | 266 |
Equity in (losses)/earnings of unconsolidated affiliates | (5 | ) |  | — |  |  | (58 | ) |  | 60 |  |  | 13 |  |  | 17 |  |  | 27 |
Impairment losses on investments | (142 | ) |  | — |  |  | (105 | ) |  | — |  |  | (21 | ) |  | — |  |  | (268 | )
Other income, net | 21 |  |  | (6 | ) |  | 1 |  |  | 3 |  |  | 19 |  |  | (4 | ) |  | 34 |
Loss on debt extinguishment | — |  |  | — |  |  | — |  |  | — |  |  | (142 | ) |  | — |  |  | (142 | )
Interest expense | (26 | ) |  | 6 |  |  | (98 | ) |  | (284 | ) |  | (495 | ) |  | 2 |  |  | (895 | )
(Loss)/income from continuing operations before income taxes | (825 | ) |  | 1,054 |  |  | (350 | ) |  | 1 |  |  | (877 | ) |  | 19 |  |  | (978 | )
Income tax (benefit)/expense | (1 | ) |  | 1 |  |  | (20 | ) |  | (1 | ) |  | 26 |  |  | — |  |  | 5 |
Net (loss)/income from continuing operations | (824 | ) |  | 1,053 |  |  | (330 | ) |  | 2 |  |  | (903 | ) |  | 19 |  |  | (983 | )
Income from discontinued operations, net of income tax | — |  |  | — |  |  | — |  |  | — |  |  | 92 |  |  |  |  |  | 92 |
Net (Loss)/Income | (824 | ) |  | 1,053 |  |  | (330 | ) |  | 2 |  |  | (811 | ) |  | 19 |  |  | (891 | )
Less: Net (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests | — |  |  | (2 | ) |  | (13 | ) |  | (54 | ) |  | 18 |  |  | (66 | ) |  | (117 | )
Net (loss)/income attributable to NRG Energy, Inc. | $ | (824 | ) |  | $ | 1,055 |  |  | $ | (317 | ) |  | $ | 56 |  |  | $ | (829 | ) |  | $ | 85 |  |  | $ | (774 | )
Balance sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments in affiliates | $ | 204 |  |  | $ | — |  |  | $ | 26 |  |  | $ | 886 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1,120 |
Capital expenditures(b) | 522 |  |  | 12 |  |  | 330 |  |  | 23 |  |  | 110 |  |  | — |  |  | 997 |
Goodwill | 276 |  |  | 374 |  |  | 12 |  |  | — |  |  | — |  |  | — |  |  | 662 |
Total assets | $ | 13,514 |  |  | $ | 2,332 |  |  | $ | 4,921 |  |  | $ | 8,962 |  |  | $ | 11,891 |  |  | $ | (10,938 | ) |  | $ | 30,682 |
(a) Inter-segment sales and net derivative gains and losses included in operating revenues | $ | 1,033 |  |  | $ | 4 |  |  | $ | 24 |  |  | $ | 8 |  |  | $ | 105 |  |  | $ | — |  |  | $ | 1,174 |
(b) Includes accruals.
| For the Year Ended December 31, 2015
| Generation(a) |  | Retail(a) |  | Renewables(a) |  | NRG Yield(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 5,179 |  |  | $ | 6,913 |  |  | $ | 383 |  |  | $ | 968 |  |  | $ | 38 |  |  | $ | (1,153 | ) |  | $ | 12,328 |
Operating expenses | 4,198 |  |  | 6,138 |  |  | 187 |  |  | 338 |  |  | 502 |  |  | (1,135 | ) |  | 10,228 |
Depreciation and amortization | 693 |  |  | 132 |  |  | 176 |  |  | 303 |  |  | 47 |  |  | — |  |  | 1,351 |
Impairment losses | 4,655 |  |  | 36 |  |  | 13 |  |  | 1 |  |  | 133 |  |  | 22 |  |  | 4,860 |
Development costs | 26 |  |  | 4 |  |  | 61 |  |  | — |  |  | 63 |  |  | — |  |  | 154 |
Total operating costs and expenses | 9,572 |  |  | 6,310 |  |  | 437 |  |  | 642 |  |  | 745 |  |  | (1,113 | ) |  | 16,593 |
Other income - affiliate | — |  |  | — |  |  | — |  |  | — |  |  | 193 |  |  | — |  |  | 193 |
Gain on postretirement benefits curtailment | 21 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21 |
Operating (loss)/income | (4,372 | ) |  | 603 |  |  | (54 | ) |  | 326 |  |  | (514 | ) |  | (40 | ) |  | (4,051 | )
Equity in earnings/(losses)of unconsolidated affiliates | 10 |  |  | — |  |  | (7 | ) |  | 31 |  |  | — |  |  | 2 |  |  | 36 |
Impairment losses on investments | (14 | ) |  | — |  |  | — |  |  | — |  |  | (42 | ) |  | — |  |  | (56 | )
Other income, net | 18 |  |  | (4 | ) |  | 3 |  |  | 3 |  |  | 13 |  |  | (7 | ) |  | 26 |
Loss on sale of equity method investment | — |  |  | — |  |  | — |  |  | — |  |  | (14 | ) |  | — |  |  | (14 | )
Loss on debt extinguishment | — |  |  | — |  |  | — |  |  | (9 | ) |  | 19 |  |  | — |  |  | 10 |
Interest expense | (25 | ) |  | 2 |  |  | (79 | ) |  | (267 | ) |  | (574 | ) |  | 6 |  |  | (937 | )
(Loss)/income from continuing operations before income taxes | (4,383 | ) |  | 601 |  |  | (137 | ) |  | 84 |  |  | (1,112 | ) |  | (39 | ) |  | (4,986 | )
Income tax expense/(benefit) | — |  |  | 1 |  |  | (18 | ) |  | 12 |  |  | 1,350 |  |  | — |  |  | 1,345 |
Net (loss)/income from continuing operations | $ | (4,383 | ) |  | 600 |  |  | (119 | ) |  | 72 |  |  | (2,462 | ) |  | (39 | ) |  | (6,331 | )
Loss from discontinued operations, net of income tax | — |  |  | — |  |  | — |  |  | — |  |  | (105 | ) |  | — |  |  | (105 | )
Net (Loss)/Income | (4,383 | ) |  | 600 |  |  | (119 | ) |  | 72 |  |  | (2,567 | ) |  | (39 | ) |  | (6,436 | )
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests | — |  |  | — |  |  | 6 |  |  | 19 |  |  | (37 | ) |  | (42 | ) |  | (54 | )
Net (loss)/income attributable to NRG Energy, Inc. | $ | (4,383 | ) |  | $ | 600 |  |  | $ | (125 | ) |  | $ | 53 |  |  | $ | (2,530 | ) |  | $ | 3 |  |  | $ | (6,382 | )
(a) Inter-segment sales and net derivative gains and losses included in operating revenues | $ | 896 |  |  | $ | 6 |  |  | $ | 31 |  |  | $ | 29 |  |  | $ | 191 |  |  | $ | — |  |  | $ | 1,153 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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