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Commitments and Contingencies (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 29 Months Ended | 104 Months Ended |  |  |
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Mar. 27, 2018 USD ($) | Feb. 16, 2018 USD ($) | Nov. 07, 2017 USD ($) | Sep. 07, 2017 USD ($) | Jun. 01, 2001 | Mar. 31, 2018 USD ($) | May 31, 2016 case | Jun. 30, 2013 case | Jun. 30, 2010 Claim Plaintiff | Aug. 31, 2009 generatingunit | Mar. 31, 2018 USD ($) lawsuit | Mar. 10, 2010 Claim | Jul. 31, 2013 Claim | Mar. 31, 2018 Plaintiff | Dec. 13, 2016 | Dec. 31, 2012 Claim | Sep. 30, 2012 Claim
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Motion filed to dismiss, claims number | case |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Pending claims | Claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5
Number of lawsuits/cases | case |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Natixis V. GenOn Mid-Atlantic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought, amount |  | $ 34,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Midwest Generation New Source Review |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of coal-fired electric generating stations | generatingunit |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Motion filed to dismiss, claims number | Claim |  |  |  |  |  |  |  |  |  |  |  | 9 | 9 |  |  |  |
Pending claims | Claim |  |  |  |  |  |  |  |  |  |  |  | 10 | 10 |  |  | 1 |
Plaintiffs | Plaintiff |  |  |  |  |  |  |  |  | 1 |  |  |  |  | 1 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Minimum | Midwest Generation New Source Review |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pending claims | Plaintiff |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Maximum | Midwest Generation New Source Review |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pending claims | Claim |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |

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