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Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2018
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,
| 2018 |  |
Guarantees | Under 1 Year |  | 1-3 Years |  | 3-5 Years |  | Over 5 Years |  | Total |  | 2017 Total
| (In millions)
Letters of credit and surety bonds(a)(b) | $ | 1,138 |  |  | $ | 79 |  |  | $ | — |  |  | $ | 36 |  |  | $ | 1,253 |  |  | $ | 1,003 |
Asset sales guarantee obligations | — |  |  | 4 |  |  | 257 |  |  | 532 |  |  | 793 |  |  | 312 |
Other guarantees | — |  |  | 105 |  |  | — |  |  | 616 |  |  | 721 |  |  | 645 |
Total guarantees | $ | 1,138 |  |  | $ | 188 |  |  | $ | 257 |  |  | $ | 1,184 |  |  | $ | 2,767 |  |  | $ | 1,960 |
(a) | As of December 31, 2017 excludes $92 million of letters of credit issued under the intercompany revolving credit agreement between NRG and GenOn
(b) | December 31, 2018 includes $32 million of letter of credit and surety bonds for the benefit of GenOn where NRG holds cash or letter of credit to back stop the liability

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12265-110248 + Details
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