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Unaudited Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Data | Unaudited Quarterly Financial Data Refer to Note 3, Discontinued Operations, Acquisitions and Dispositions, and Note 10, Asset Impairments, for a description of the effect of unusual or infrequently occurring events during the quarterly periods. Summarized unaudited quarterly financial data is as follows:
| Quarter Ended
| 2017
| December 31 |  | September 30 |  | June 30 |  | March 31
| (In millions, except per share data)
Operating revenues | $ | 2,497 |  |  | $ | 3,049 |  |  | $ | 2,701 |  |  | $ | 2,382 |
Operating (loss)/ income | (1,345 | ) |  | 376 |  |  | 343 |  |  | 39 |
Net (loss)/income from continuing operations | (1,667 | ) |  | 190 |  |  | 99 |  |  | (170 | )
Income/(loss) from discontinued operations | 13 |  |  | (27 | ) |  | (741 | ) |  | (34 | )
Net (loss)/income | (1,655 | ) |  | 163 |  |  | (642 | ) |  | (203 | )
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests | (120 | ) |  | (8 | ) |  | (16 | ) |  | (40 | )
Net (loss)/income attributable to NRG Energy, Inc. | (1,535 | ) |  | 171 |  |  | (626 | ) |  | (163 | )
(Loss)/income available to Common Stockholders | $ | (1,535 | ) |  | $ | 171 |  |  | $ | (626 | ) |  | $ | (163 | )
Weighted average number of common shares outstanding — basic | 317 |  |  | 317 |  |  | 316 |  |  | 316 |
Income/(loss) from discontinued operations per weighted average common share — basic | $ | 0.04 |  |  | $ | (0.09 | ) |  | $ | (2.34 | ) |  | $ | (0.11 | )
Net (loss)/income per weighted average common share — basic | $ | (4.84 | ) |  | $ | 0.54 |  |  | $ | (1.98 | ) |  | $ | (0.52 | )
Weighted average number of common shares outstanding — diluted | 317 |  |  | 322 |  |  | 316 |  |  | 316 |
Income/(loss) from discontinued operations per weighted average common share — diluted | $ | 0.04 |  |  | $ | (0.08 | ) |  | $ | (2.34 | ) |  | $ | (0.11 | )
Net (loss)/income per weighted average common share — diluted | $ | (4.84 | ) |  | $ | 0.53 |  |  | $ | (1.98 | ) |  | $ | (0.52 | )
| Quarter Ended
| 2016
| December 31 |  | September 30 |  | June 30 |  | March 31
| (In millions, except per share data)
Operating revenues | $ | 2,184 |  |  | $ | 3,421 |  |  | $ | 2,248 |  |  | $ | 2,659 |
Operating (loss)/income | (658 | ) | — |  | 429 |  | — |  | 164 |  |  | 331 |
Net (loss)/income from continuing operations | (891 | ) |  | 128 |  |  | (163 | ) |  | (57 | )
(Loss)/income from discontinued operations | (164 | ) |  | 265 |  |  | (113 | ) |  | 104 |
Net (loss)/income | (1,055 | ) |  | 393 |  |  | (276 | ) |  | 47 |
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests | (68 | ) | — |  | (9 | ) |  | (5 | ) |  | (35 | )
Net (loss)/income attributable to NRG Energy, Inc. | (987 | ) |  | 402 |  |  | (271 | ) |  | 82 |
(Loss)/income available to Common Stockholders | $ | (987 | ) |  | $ | 402 |  |  | $ | (193 | ) |  | $ | 77 |
Weighted average number of common shares outstanding — basic | 316 |  |  | 316 |  | — |  | 315 |  |  | 315 |
(Loss)/income from discontinued operations per weighted average common share — basic | $ | (0.52 | ) |  | $ | 0.84 |  |  | $ | (0.36 | ) |  | $ | 0.33 |
Net (loss)/income per weighted average common share — basic | $ | (3.12 | ) |  | $ | 1.27 |  |  | $ | (0.61 | ) |  | $ | 0.24 |
Weighted average number of common shares outstanding — diluted | 316 |  |  | 317 |  |  | 315 |  |  | 315 |
(Loss)/income from discontinued operations per weighted average common share — diluted | $ | (0.52 | ) |  | $ | 0.84 |  |  | $ | (0.36 | ) |  | $ | 0.33 |
Net (loss)/income per weighted average common share — diluted | $ | (3.12 | ) | — |  | $ | 1.27 |  | — |  | $ | (0.61 | ) | — |  | $ | 0.24 |

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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