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Commitments and Contingencies (Details) shares in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 7 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 10, 2018 USD ($) | Mar. 27, 2018 USD ($) | Feb. 26, 2018 USD ($) case | Feb. 16, 2018 USD ($) | Nov. 07, 2017 USD ($) | Sep. 07, 2017 USD ($) | Jun. 01, 2001 | May 31, 2016 lawsuit | Jun. 30, 2018 USD ($) lawsuit shares | Mar. 10, 2010 Claim | Dec. 13, 2016
GenOn Energy | Senior Notes | Senior Unsecured Notes 2017 |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 7.875%
GenOn Energy | Senior Notes | Senior Unsecured Notes 2018 |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 9.50%
GenOn Energy | Senior Notes | Senior Unsecured Notes 2020 |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 9.875%
GenOn Americas Generation, LLC | Senior Notes | Senior Unsecured Notes 2021 |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 8.50%
GenOn Americas Generation, LLC | Senior Notes | Senior Unsecured Notes 2031 |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 9.125%
Midwest Generation Asbestos Liabilities |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Damages sought, amount |  | $ 61,000,000 |  |  |  |  |  |  |  |  |
Telephone Consumer Protection Act Purported Class Actions |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Damages sought, amount |  |  |  |  |  |  |  |  | $ 1,500 |  |
Number of lawsuits/cases | lawsuit |  |  |  |  |  |  |  |  | 3 |  |
Telephone Consumer Protection Act Purported Class Actions | CALIFORNIA |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits/cases | lawsuit |  |  |  |  |  |  |  |  | 1 |  |
Telephone Consumer Protection Act Purported Class Actions | NEW JERSEY |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits/cases | lawsuit |  |  |  |  |  |  |  |  | 2 |  |
CDWR and SDGE v Sunrise Power |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Damages sought, amount |  |  |  |  |  |  |  |  | $ 1,200,000 |  |
PPA period |  |  |  |  |  |  | 10 years |  |  |  |
Remaining term |  |  |  |  |  |  |  |  | 70 months |  |
Morgantown V. GenOn Mid-Atlantic |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Damages sought, amount |  |  |  |  | $ 0 |  |  |  |  |  |
BTEC New Albany v. NRG Texas Power LLC |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Damages sought, amount |  |  |  |  |  | $ 48,000,000 |  |  |  |  |
Natural Gas Litigation |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Damages sought, amount |  |  | $ 0 |  |  |  |  |  |  |  |
Number of lawsuits/cases |  |  | 4 |  |  |  |  | 4 |  |  |
Natixis V. GenOn Mid-Atlantic |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Damages sought, amount |  |  |  | $ 34,000,000 |  |  |  |  |  |  |
Midwest Generation New Source Review |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Motion filed to dismiss, claims number | Claim |  |  |  |  |  |  |  |  |  | 9 |
Pending claims | Claim |  |  |  |  |  |  |  |  |  | 10 |
Midwest Generation New Source Review | State of Illinois |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Settlement amount to be paid | $ 500,000 |  |  |  |  |  |  |  |  |  |
Midwest Generation New Source Review | Federal Government |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Settlement amount to be paid | $ 500,000 |  |  |  |  |  |  |  |  |  |
Bankruptcy | Chapter Eleven Proceedings |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Common stock capital shares reserved for unresolved claims (in shares) | shares |  |  |  |  |  |  |  |  | 461 |  |
Common stock capital shares reserved converted into parent co. common (in shares) | shares |  |  |  |  |  |  |  |  | 1,300 |  |
Number of reserved shares for disputed Chapter 11 claims converted into reserved of NRG common stock (in shares) | shares |  |  |  |  |  |  |  |  | 159 |  |

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