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Jointly Owned Plants (Notes) | 12 Months Ended
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Dec. 31, 2017
Jointly Owned Plants Disclosure [Abstract] |
Jointly Owned Plants | Jointly Owned Plants Certain NRG subsidiaries own undivided interests in jointly-owned plants, as described below. These plants are maintained and operated pursuant to their joint ownership participation and operating agreements. NRG is responsible for its subsidiaries' share of operating costs and direct expenses and includes its proportionate share of the facilities and related revenues and direct expenses in these jointly-owned plants in the corresponding balance sheet and income statement captions of the Company's consolidated financial statements. 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 -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition Describes that the entity has a proportionate interest in a jointly owned plant. Should include a table showing separately for each interest the amount of plant in service; the accumulated provision for depreciation; the balance of property plant and equipment; the amount of plant under construction; and the proportionate share. Should include statements that the amounts represent the entity'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. Should state that the entity'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). + References No definition available. + Details
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