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Related Party Transactions - Credit Agreement with GenOn (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Amount outstanding	$ 7,436,000,000	$ 9,494,000,000
Cash collateral paid in support of energy risk management activities	209,000,000	171,000,000
GenOn
Related Party Transaction [Line Items]
Cash collateral paid in support of energy risk management activities	15,000,000	32,000,000
GenOn | Revolving Credit Facility | Intercompany Credit Agreement
Related Party Transaction [Line Items]
Credit facility maximum borrowing capacity	500,000,000
Letters of credit outstanding under revolver	30,000,000	92,000,000
Amount outstanding	$ 0	$ 125,000,000

X

- Definition

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

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+ References

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