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Acquisitions, Discontinued Operations and Dispositions - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Jul. 16, 2018
Apr. 27, 2018
Mar. 22, 2018
Dec. 31, 2017
Jun. 30, 2018
Dec. 31, 2017
GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Pension liability         $ 90.0  
Liability, other postretirement-employment and retiree heal and welfare benefits         25.0  
GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Settlement consideration         261.3  
Professional fees   $ 6.0        
GenOn Entities | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Credit applied           $ 28.0
Shared services, annualized rate       $ 84.0   84.0
Plan of Reorganization            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Intercompany secured revolving credit facility and accrued interest and fees         $ 151.0  
Percentage of aggregate principal amount         93.00%  
Payment of pension contributions       13.0   13.0
Plan of Reorganization | GenOn Mid-Atlantic | Intercompany Credit Agreement | Letter of Credit            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Letters of credit   $ 37.5        
Plan of Reorganization | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Credit applied           28.0
Payment to affiliate         $ 18.0  
Shared services, annualized rate       84.0   $ 84.0
Plan of Reorganization | Services Agreement | GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payment to affiliate     $ 13.5 $ 15.0    
Subsequent Event | GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Settlement consideration $ 261.0          
Subsequent Event | GenOn Entities | Assignment Of Historical Claims Against REMA            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due 8.0          
Subsequent Event | GenOn Entities | Reduction Of Settlement Payment            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due 4.2          
Subsequent Event | GenOn Entities | Indemnification Of Potential Claims By REMA (up to)            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due 10.0          
Subsequent Event | Plan of Reorganization | Services Agreement | GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payment to affiliate 15.0          
Subsequent Event | Plan of Reorganization | GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payments to affiliate, settlement agreement 125.0          
Subsequent Event | Plan of Reorganization | GenOn Entities | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Credit applied 28.0          
Remaining payments and other balances due 10.0          
Subsequent Event | Plan of Reorganization | GenOn Entities | Revolving Credit Facility Borrowings            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Intercompany secured revolving credit facility and accrued interest and fees 151.0          
Subsequent Event | Plan of Reorganization | GenOn Entities | Accrued Interest On Borrowings            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Intercompany secured revolving credit facility and accrued interest and fees 12.0          
Subsequent Event | Plan of Reorganization | GenOn Entities | Other            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due $ 6.0