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Commitments and Contingencies (Details)						1 Months Ended					3 Months Ended	7 Months Ended	29 Months Ended	104 Months Ended
	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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