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Related Party Transactions - Credit Agreement with GenOn (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Long-term debt	$ 16,584,000,000	$ 16,633,000,000
Cash collateral paid in support of energy risk management activities	211,000,000	171,000,000
GenOn
Related Party Transaction [Line Items]
Cash collateral paid in support of energy risk management activities	28,000,000	32,000,000
Settlement consideration	261,300,000
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	86,000,000	$ 92,000,000
Long-term debt	$ 125,000,000

X

- Definition

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

+ References

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-Name Accounting Standards Codification
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-SubTopic 20
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount expected to be recognized in earnings for the specified restructuring cost.

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