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Related Party Transactions - Credit Agreement with GenOn and Commercial Operations Agreement (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Long-term debt	$ 6,691,000,000	$ 9,494,000,000
Cash collateral posted in support of energy risk management activities	287,000,000	171,000,000
GenOn
Related Party Transaction [Line Items]
Cash collateral posted in support of energy risk management activities	4,000,000	32,000,000
Revolving Credit Facility | Intercompany Credit Agreement | GenOn
Related Party Transaction [Line Items]
Revolving credit facility	500,000,000
Letters of credit outstanding under revolver	$ 30,000,000	$ 92,000,000

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- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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