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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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