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Acquisitions, Discontinued Operations and Dispositions - GenOn and GenMA Settlement (Details) - USD ($)
$ in Millions
Jul. 16, 2018
Apr. 27, 2018
GenOn | Services Agreement | Restructuring Support Agreement    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Return of collateral posted to NRG $ 15.0  
GenOn Mid-Atlantic | Restructuring Support Agreement | Letter of Credit | Intercompany Credit Agreement    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Letters of credit, new credit support   $ 37.5
Affiliated Entity    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Settlement consideration 261.0  
Professional fees   $ 6.0
Affiliated Entity | Restructuring Support Agreement    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Settlement agreement, payment 125.0  
Affiliated Entity | Services Agreement | Restructuring Support Agreement    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Transition services credit 28.0  
Related Party Transaction, Due from (to) Related Party 10.0  
Affiliated Entity | Revolving Credit Facility Borrowings | Restructuring Support Agreement    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Borrowings under intercompany agreement 151.0  
Affiliated Entity | Accrued Interest On Borrowings | Restructuring Support Agreement    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Borrowings under intercompany agreement 12.0  
Affiliated Entity | Reduction Of Settlement Payment    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Related Party Transaction, Due from (to) Related Party 4.0  
Affiliated Entity | Assignment Of Historical Claims Against REMA    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Related Party Transaction, Due from (to) Related Party 8.0  
Affiliated Entity | Other | Restructuring Support Agreement    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Related Party Transaction, Due from (to) Related Party $ 2.0