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Segment Reporting | 12 Months Ended
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Dec. 31, 2018
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 into the Generation, Retail and corporate segments. Generation includes all power plant activities, domestic and international, as well as renewables. Retail includes Mass customers and Business Solutions, which includes C&I customers and other distributed and reliability products. Intersegment sales are accounted for at market. As described in Note 3, Acquisitions, Discontinued Operations and Dispositions, the Company has determined that the South Central Portfolio, NRG Yield Inc. and its Renewables Platform, Carlsbad, and GenOn all qualified for treatment as discontinued operations. The financial information for all historical periods has been recast to reflect the presentation of 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 year ended December 31, 2018, the Company had one customer in the Generation segment that comprised 11% of the Company's consolidated revenues. During the years ended December 31, 2017 and 2016, the Company had no customer that comprised more than 10% of the Company's consolidated revenues.
| For the Year Ended December 31, 2018
| Retail (a) |  | Generation(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 7,103 |  |  | $ | 3,432 |  |  | $ | 11 |  |  | $ | (1,068 | ) |  | $ | 9,478 |
Operating expenses | 5,919 |  |  | 3,019 |  |  | 125 |  |  | (1,066 | ) |  | 7,997 |
Depreciation and amortization | 116 |  |  | 272 |  |  | 33 |  |  | — |  |  | 421 |
Impairment losses | 1 |  |  | 98 |  |  | — |  |  | — |  |  | 99 |
Development costs | 1 |  |  | 9 |  |  | 2 |  |  | (1 | ) |  | 11 |
Total operating cost and expenses | 6,037 |  |  | 3,398 |  |  | 160 |  |  | (1,067 | ) |  | 8,528 |
Gain on sale of assets | — |  |  | 2 |  |  | 30 |  |  | — |  |  | 32 |
Operating income/(loss) | 1,066 |  |  | 36 |  |  | (119 | ) |  | (1 | ) |  | 982 |
Equity in earnings of unconsolidated affiliates | — |  |  | 10 |  |  | 4 |  |  | (5 | ) |  | 9 |
Impairment losses on investments | — |  |  | (15 | ) |  | — |  |  | — |  |  | (15 | )
Other income/(expenses), net | — |  |  | 20 |  |  | (1 | ) |  | (1 | ) |  | 18 |
Loss on debt extinguishment | — |  |  | — |  |  | (44 | ) |  | — |  |  | (44 | )
Interest expense | (3 | ) |  | (58 | ) |  | (422 | ) |  | — |  |  | (483 | )
Income/(loss) from continuing operations before income taxes | 1,063 |  |  | (7 | ) |  | (582 | ) |  | (7 | ) |  | 467 |
Income tax expense | 1 |  |  | — |  |  | 6 |  |  | — |  |  | 7 |
Net income/(loss) from continuing operations | 1,062 |  |  | (7 | ) |  | (588 | ) |  | (7 | ) |  | 460 |
Loss from discontinued operations, net of income tax | — |  |  | — |  |  | (192 | ) |  | — |  |  | (192 | )
Net Income/(loss) | 1,062 |  |  | (7 | ) |  | (780 | ) |  | (7 | ) |  | 268 |
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests | 1 |  |  | 9 |  |  | (5 | ) |  | (5 | ) |  | — |
Net income/(loss) attributable to NRG Energy, Inc. | $ | 1,061 |  |  | $ | (16 | ) |  | $ | (775 | ) |  | $ | (2 | ) |  | $ | 268 |
Balance sheet |  |  |  |  |  |  |  |  |
Equity investments in affiliates | $ | — |  |  | $ | 412 |  |  | $ | — |  |  | $ | — |  |  | $ | 412 |
Capital expenditures | 90 |  |  | 267 |  |  | 31 |  |  | — |  |  | 388 |
Goodwill | 408 |  |  | 165 |  |  | — |  |  | — |  |  | 573 |
Total assets | $ | 3,291 |  |  | $ | 5,735 |  |  | $ | 7,003 |  |  | $ | (5,401 | ) |  | $ | 10,628 |
(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues | $ | 9 |  |  | $ | 1,085 |  |  | $ | (26 | ) |  | $ | — |  |  | $ | 1,068 |
| For the Year Ended December 31, 2017
| Retail (a) |  | Generation(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 6,369 |  |  | $ | 3,615 |  |  | $ | 13 |  |  | $ | (923 | ) |  | $ | 9,074 |
Operating expenses | 5,377 |  |  | 3,071 |  |  | 243 |  |  | (925 | ) |  | 7,766 |
Depreciation and amortization | 110 |  |  | 454 |  |  | 35 |  |  | (3 | ) |  | 596 |
Impairment losses | 8 |  |  | 1,526 |  |  | — |  |  | — |  |  | 1,534 |
Development costs | 3 |  |  | 13 |  |  | 6 |  |  | — |  |  | 22 |
Total operating cost and expenses | 5,498 |  |  | 5,064 |  |  | 284 |  |  | (928 | ) |  | 9,918 |
Other income - affiliate | — |  |  | — |  |  | 87 |  |  | — |  |  | 87 |
Gain on sale of assets | — |  |  | 15 |  |  | 1 |  |  | — |  |  | 16 |
Operating income/(loss) | 871 |  |  | (1,434 | ) |  | (183 | ) |  | 5 |  |  | (741 | )
Equity in (losses)/earnings of unconsolidated affiliates | — |  |  | (14 | ) |  | 5 |  |  | (5 | ) |  | (14 | )
Impairment losses on investments | — |  |  | (75 | ) |  | (4 | ) |  | — |  |  | (79 | )
Other income, net | — |  |  | 23 |  |  | 28 |  |  | — |  |  | 51 |
Loss on debt extinguishment | — |  |  | — |  |  | (49 | ) |  | — |  |  | (49 | )
Interest expense | (6 | ) |  | (100 | ) |  | (451 | ) |  | — |  |  | (557 | )
Income/(loss) from continuing operations before income taxes | 865 |  |  | (1,600 | ) |  | (654 | ) |  | — |  |  | (1,389 | )
Income tax (benefit)/expense | (8 | ) |  | 2 |  |  | (38 | ) |  | — |  |  | (44 | )
Net income/(loss) from continuing operations | 873 |  |  | (1,602 | ) |  | (616 | ) |  | — |  |  | (1,345 | )
Loss from discontinued operations, net of income tax | — |  |  | — |  |  | (992 | ) |  | — |  |  | (992 | )
Net Income/(loss) | 873 |  |  | (1,602 | ) |  | (1,608 | ) |  | — |  |  | (2,337 | )
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests | 1 |  |  | 4 |  |  | (189 | ) |  | — |  |  | (184 | )
Net income/(loss) attributable to NRG Energy, Inc. | $ | 872 |  |  | $ | (1,606 | ) |  | $ | (1,419 | ) |  | $ | — |  |  | $ | (2,153 | )
Balance sheet |  |  |  |  |  |  |  |  |
Equity investments in affiliates | $ | — |  |  | $ | 179 |  |  | $ | 95 |  |  | $ | (92 | ) |  | $ | 182 |
Capital expenditures | 82 |  |  | 148 |  |  | 20 |  |  | — |  |  | 250 |
Goodwill | 374 |  |  | 165 |  |  | — |  |  | — |  |  | 539 |
Total assets | $ | 2,655 |  |  | $ | 9,090 |  |  | $ | 17,402 |  |  | $ | (5,792 | ) |  | $ | 23,355 |
(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues | $ | 4 |  |  | $ | 877 |  |  | $ | 42 |  |  | $ | — |  |  | $ | 923 |
| For the Year Ended December 31, 2016
| Retail |  | Generation(a) |  | Corporate(a) |  | Eliminations |  | Total
| (In millions)
Operating revenues(a) | $ | 6,330 |  |  | $ | 3,633 |  |  | $ | 74 |  |  | $ | (1,122 | ) |  | $ | 8,915 |
Operating expenses | 5,162 |  |  | 3,322 |  |  | 353 |  |  | (1,129 | ) |  | 7,708 |
Depreciation and amortization | 114 |  |  | 593 |  |  | 52 |  |  | (3 | ) |  | 756 |
Impairment losses | 1 |  |  | 452 |  |  | 30 |  |  | — |  |  | 483 |
Development costs | 4 |  |  | 15 |  |  | 29 |  |  | — |  |  | 48 |
Total operating costs and expenses | 5,281 |  |  | 4,382 |  |  | 464 |  |  | (1,132 | ) |  | 8,995 |
Other income - affiliate | — |  |  | — |  |  | 193 |  |  | — |  |  | 193 |
Loss on sale of assets | (1 | ) |  | — |  |  | (79 | ) |  | — |  |  | (80 | )
Operating income/(loss) | 1,048 |  |  | (749 | ) |  | (276 | ) |  | 10 |  |  | 33 |
Equity in (losses)/earnings of unconsolidated affiliates | — |  |  | (63 | ) |  | 45 |  |  | — |  |  | (18 | )
Impairment losses on investments | — |  |  | (248 | ) |  | (20 | ) |  | — |  |  | (268 | )
Other (expense)/income, net | (6 | ) |  | 22 |  |  | 33 |  |  | (2 | ) |  | 47 |
Loss on debt extinguishment | — |  |  | — |  |  | (142 | ) |  | — |  |  | (142 | )
Interest expense | 6 |  |  | (96 | ) |  | (495 | ) |  | 2 |  |  | (583 | )
Income/(loss) from continuing operations before income taxes | 1,048 |  |  | (1,134 | ) |  | (855 | ) |  | 10 |  |  | (931 | )
Income tax expense/(benefit) | 1 |  |  | (1 | ) |  | 25 |  |  | — |  |  | 25 |
Net income/(loss) from continuing operations | $ | 1,047 |  |  | $ | (1,133 | ) |  | (880 | ) |  | 10 |  |  | (956 | )
Income from discontinued operations, net of income tax | — |  |  | — |  |  | 65 |  |  | — |  |  | 65 |
Net Income/(loss) | 1,047 |  |  | (1,133 | ) |  | (815 | ) |  | 10 |  |  | (891 | )
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests | — |  |  | (1 | ) |  | (104 | ) |  | (12 | ) |  | (117 | )
Net income/(loss) attributable to NRG Energy, Inc. | $ | 1,047 |  |  | $ | (1,132 | ) |  | $ | (711 | ) |  | $ | 22 |  |  | $ | (774 | )
(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues | $ | 16 |  |  | $ | 999 |  |  | $ | 107 |  |  | $ | — |  |  | $ | 1,122 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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