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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2017
Related Party Transactions [Abstract] |
Summary of NRG's material related-party transactions with affiliates | The following table summarizes NRG's material related party transactions with third party affiliates that are included in the Company's operating revenues, operating costs and other income and expense:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In millions)
Revenues from Related Parties Included in Operating Revenues |  |  |  |  |
Gladstone | $ | 3 |  |  | $ | 2 |  |  | $ | 4 |
GenConn | 5 |  |  | 5 |  |  | 4 |
Total | $ | 8 |  |  | $ | 7 |  |  | $ | 8 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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