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Investments Accounted for by the Equity Method and Variable Interest Entities (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract] |
Summary NRG's equity method investments | The following table summarizes NRG's equity method investments as of December 31, 2018:
Name | Economic Interest |  | Investment Balance
|  |  | (In millions)
Agua Caliente | 35.0 | % |  | 200 |
Gladstone | 37.5 | % |  | 140 |
Ivanpah Master Holdings, LLC | 54.5 | % |  | 37 |
Watson Cogeneration Company | 49.0 | % |  | 17 |
Midway-Sunset Cogeneration Company | 50.0 | % |  | 12 |
Other(a) | Various |  |  | 6 |
Total equity investments in affiliates |  |  | $ | 412 |
(a) Refer to Note 9, Asset Impairments, for discussion of NRG's investment in Petra Nova Parish Holdings, LLC
Undistributed earnings by equity investment |
| As of December 31,
| 2018 |  | 2017
| (In millions)
Undistributed earnings from equity investments | $ | 34 |  |  | $ | 38 |
Summary of Financial Information for Consolidated VIEs | The summarized financial information for the Company's consolidated VIEs consisted of the following:
(In millions) | December 31, 2018 |  | December 31, 2017
Current assets | $ | 3 |  |  | $ | 6 |
Net property, plant and equipment | 76 |  |  | 80 |
Other long-term assets | 28 |  |  | 36 |
Total assets | 107 |  |  | 122 |
Current liabilities | 2 |  |  | 3 |
Long-term debt | 29 |  |  | 30 |
Other long-term liabilities | 7 |  |  | 7 |
Total liabilities | 38 |  |  | 40 |
Redeemable noncontrolling interests | 19 |  |  | 19 |
Net assets less noncontrolling interests | $ | 50 |  |  | $ | 63 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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