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Jointly Owned Plants (Tables) | 12 Months Ended
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Dec. 31, 2017
Jointly Owned Plants Disclosure [Abstract] |
Summary of NRG's proportionate ownership interest in the company's jointly-owned facilities | The following table summarizes NRG's proportionate ownership interest in the Company's jointly-owned facilities:
As of December 31, 2017 | Ownership Interest |  | Property, Plant & Equipment |  | Accumulated Depreciation |  | Construction in Progress
| (In millions unless otherwise stated)
South Texas Project Units 1 and 2, Bay City, TX | 44.00 | % |  | $ | 395 |  |  | $ | (207 | ) |  | $ | 7 |
Big Cajun II Unit 3, New Roads, LA | 58.00 | % |  | 202 |  |  | (132 | ) |  | — |
Cedar Bayou Unit 4, Baytown, TX | 50.00 | % |  | 215 |  |  | (75 | ) |  | 7 |
Keystone, Shelocta, PA | 3.70 | % |  | 12 |  |  | — |  |  | 1 |
Conemaugh, New Florence, PA | 3.72 | % |  | 14 |  |  | — |  |  | 1 |

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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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