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Segment Reporting (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Schedule of segment reporting information, by segment |
| Retail (a) |  | Generation(a) |  | Renewables(a) |  | NRG Yield |  | Corporate(a) |  | Eliminations |  | Total
Three months ended March 31, 2018 |  |  | (In millions)
Operating revenues(a) | $ | 1,481 |  |  | $ | 327 |  |  | $ | 86 |  |  | $ | 225 |  |  | $ | 2 |  |  | $ | 300 |  |  | $ | 2,421 |
Depreciation and amortization | 28 |  |  | 67 |  |  | 51 |  |  | 81 |  |  | 8 |  |  | — |  |  | 235 |
Reorganization costs | 3 |  |  | 4 |  |  | — |  |  | — |  |  | 13 |  |  | — |  |  | 20 |
Equity in earnings/(losses) of unconsolidated affiliates | — |  |  | 2 |  |  | — |  |  | 4 |  |  | (1 | ) |  | (7 | ) |  | (2 | )
Income/(loss) from continuing operations before income taxes | 946 |  |  | (536 | ) |  | (40 | ) |  | (1 | ) |  | (126 | ) |  | (11 | ) |  | 232 |
Income/(loss) from continuing operations | 946 |  |  | (536 | ) |  | (34 | ) |  | — |  |  | (132 | ) |  | (11 | ) |  | 233 |
Net Income/(Loss) | 946 |  |  | (536 | ) |  | (34 | ) |  | — |  |  | (132 | ) |  | (11 | ) |  | 233 |
Net Income/(Loss) attributable to NRG Energy, Inc. | $ | 940 |  |  | $ | (536 | ) |  | $ | 1 |  |  | $ | 21 |  | — |  | $ | (148 | ) |  | $ | 1 |  |  | $ | 279 |
Total assets as of March 31, 2018 | $ | 3,521 |  |  | $ | 7,313 |  |  | $ | 5,191 |  |  | $ | 8,362 |  |  | $ | 9,108 |  |  | $ | (9,743 | ) |  | $ | 23,752 |
(a) Operating revenues include inter-segment sales and net derivative gains and losses of: | $ | 1 |  |  | $ | (307 | ) |  | $ | 8 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | — |  |  | $ | (300 | )
| Retail(a) |  | Generation(a) |  | Renewables(a) |  | NRG Yield |  | Corporate(a)(b) |  | Eliminations |  | Total
Three months ended March 31, 2017 |  |  | (In millions)
Operating revenues(a) | $ | 1,335 |  |  | $ | 965 |  |  | $ | 95 |  |  | $ | 221 |  |  | $ | 10 |  |  | $ | (244 | ) |  | $ | 2,382 |
Depreciation and amortization | 28 |  |  | 97 |  |  | 47 |  |  | 77 |  |  | 8 |  |  | — |  |  | 257 |
Equity in (losses)/earnings of unconsolidated affiliates | — |  |  | (13 | ) |  | — |  |  | 19 |  |  | 3 |  |  | (4 | ) |  | 5 |
(Loss)/income from continuing operations before income taxes | (31 | ) |  | 37 |  |  | (35 | ) |  | (3 | ) |  | (137 | ) |  | (4 | ) |  | (173 | )
(Loss)/income from continuing operations | (34 | ) |  | 37 |  |  | (29 | ) |  | (2 | ) |  | (137 | ) |  | (4 | ) |  | (169 | )
Loss from discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | — |  |  | (34 | ) |  | — |  |  | (34 | )
Net (Loss)/Income | (34 | ) |  | 37 |  |  | (29 | ) |  | (2 | ) |  | (171 | ) |  | (4 | ) |  | (203 | )
Net (Loss)/Income attributable to NRG Energy, Inc. | $ | (33 | ) |  | $ | 37 |  |  | $ | (1 | ) |  | $ | 12 |  |  | $ | (171 | ) |  | $ | (7 | ) |  | $ | (163 | )
(a) Operating revenues include inter-segment sales and net derivative gains and losses of: | $ | 1 |  |  | $ | 209 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |  |  | $ | 244 |
(b) Includes other income - affiliate | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 48 |  |  | $ | — |  |  | $ | 48 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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