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Commitments and Contingencies (Details)						1 Months Ended	9 Months Ended
	Mar. 27, 2018 USD ($)	Feb. 26, 2018 USD ($) case	Feb. 16, 2018 USD ($)	Sep. 07, 2017 USD ($)	Jun. 01, 2001	May 31, 2016 lawsuit	Sep. 30, 2018 USD ($) lawsuit	Aug. 18, 2016 USD ($)
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
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
Lignite Contract With Texas Westmoreland Coal Co.
Loss Contingencies
Bond obligation								$ 99,000,000

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Third Party Bond Obligation

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