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Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2017
Guarantees [Abstract] |
Summary of NRG's estimated guarantees, indemnity, and other contingent liability | The following table summarizes the maximum potential exposures that can be estimated for NRG's guarantees, indemnities, and other contingent liabilities by maturity:
| By Remaining Maturity at December 31,
| 2017 |  |
Guarantees | Under 1 Year |  | 1-3 Years |  | 3-5 Years |  | Over 5 Years |  | Total |  | 2016 Total
| (In millions)
Letters of credit and surety bonds(a) | $ | 1,467 |  |  | $ | 66 |  |  | $ | 7 |  |  | $ | 93 |  |  | $ | 1,633 |  |  | $ | 1,837 |
Asset sales guarantee obligations | — |  |  | — |  |  | 257 |  |  | 55 |  |  | 312 |  |  | 677 |
Other guarantees | — |  |  | 32 |  |  | — |  |  | 613 |  |  | 645 |  |  | 253 |
Total guarantees | $ | 1,467 |  |  | $ | 98 |  |  | $ | 264 |  |  | $ | 761 |  |  | $ | 2,590 |  |  | $ | 2,767 |
(a) | Excludes$92 million and $272 million of letters of credit issued under the intercompany revolving credit agreement between NRG and GenOn as of December 31, 2017 and 2016, respectively.

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- Definition Tabular disclosure of each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12265-110248 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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