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Benefit Plans and Other Postretirement Benefits - Narrative (Details) $ in Millions	Dec. 31, 2019 USD ($) numberOfBenefitPlans	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Benefit Plans and Other Postretirement Benefits
Number of qualified pension plans | numberOfBenefitPlans	2
Pension Benefits
Benefit Plans and Other Postretirement Benefits
Expects to contribute to the pension plans	$ 56
GenOn
Benefit Plans and Other Postretirement Benefits
Pension liability retained			$ 92
Liability retained other post-employment and retiree health and welfare benefits		$ 23
GenOn | Restructuring Support Agreement
Benefit Plans and Other Postretirement Benefits
Amount of pension liability future contributions			$ 13
Expects to contribute to the pension plans	$ 21

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Number Of Defined Benefit Plans

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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-Paragraph 1
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Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

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Amount of liability, recognized in statement of financial position, for defined benefit other postretirement plan. Excludes pension plan.

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