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Commitments and Contingencies - Contingencies (Details 2)				1 Months Ended
	Feb. 16, 2018 USD ($)	Nov. 07, 2017 USD ($)	Sep. 07, 2017 USD ($)	May 31, 2016 case	Jun. 30, 2013 case	Jun. 14, 2017	Dec. 13, 2016	Sep. 30, 2012 Claim
Morgantown V. GenOn Mid-Atlantic
Loss Contingencies
Damages sought		$ 0
BTEC New Albany v. NRG Texas Power
Loss Contingencies
Damages sought			$ 48,000,000
Natural Gas Litigation
Loss Contingencies
Number of cases | case				1
Claims dismissed | case					1
Pending claims | Claim								5
GenOn Senior Notes Due in 2017
Loss Contingencies
Interest rate, stated percentage						7.875%
GenOn Senior Notes Due in 2017 | Non Recourse Debt
Loss Contingencies
Interest rate, stated percentage							7.875%
GenOn senior notes, due 2018
Loss Contingencies
Interest rate, stated percentage						9.50%
GenOn senior notes, due 2018 | Non Recourse Debt
Loss Contingencies
Interest rate, stated percentage							9.50%
GenOn senior notes, due 2020
Loss Contingencies
Interest rate, stated percentage						9.875%
GenOn senior notes, due 2020 | Non Recourse Debt
Loss Contingencies
Interest rate, stated percentage							9.875%
GenOn Americas Generation Senior Notes Due in 2021
Loss Contingencies
Interest rate, stated percentage						8.50%
GenOn Americas Generation Senior Notes Due in 2021 | Non Recourse Debt
Loss Contingencies
Interest rate, stated percentage							8.50%
GenOn Americas Generation senior notes, due 2031
Loss Contingencies
Interest rate, stated percentage						9.125%
GenOn Americas Generation senior notes, due 2031 | Non Recourse Debt
Loss Contingencies
Interest rate, stated percentage							9.125%
Subsequent Event | Natixis V. GenOn Mid-Atlantic
Loss Contingencies
Damages sought	$ 34,000,000

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-Name Accounting Standards Codification
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-SubTopic 10
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