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Discontinued Operations, Acquisitions and Dispositions - Discontinued Operations (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 14, 2017 | Jun. 12, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Other income - affiliate |  |  | $ 84.0 |  | $ 87.0 | $ 193.0 | $ 193.0 |
Receivable from affiliate |  |  |  |  | 125.0 | 0.0 | $ 0.0 |
Long-term debt |  |  | $ 16,633.0 | $ 16,633.0 | $ 16,633.0 | 16,704.0 |  |
GenOn | Discontinued Operations |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 2,500.0 |  |  |  |  |  |  |
Restructuring Support Agreement |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Aggregate principal percentage threshold |  |  | 93.00% | 93.00% | 93.00% |  |  |
Amount due from GenOn |  |  | $ 125.0 | $ 125.0 | $ 125.0 |  |  |
Amount of pension liability future contributions |  |  | 13.0 | 13.0 | 13.0 |  |  | $ 13.0
GenOn |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Pension liability retained |  |  | 92.0 | 92.0 | 92.0 | $ 120.0 |  |
Liability retained other post-employment and retiree health and welfare benefits |  |  | 25.0 | 25.0 | 25.0 |  |  |
GenOn | Restructuring Support Agreement |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Amount of pension liability future contributions |  |  |  |  |  |  |  | $ 13.0
Services Agreement | Restructuring Support Agreement |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Credit applied |  | $ 28.0 | 3.5 |  | 28.0 |  |  |
Receivable from affiliate |  |  | 15.0 |  |  |  |  |
Shared services annualized rate |  | $ 84.0 | 84.0 | 84.0 | 84.0 |  |  |
Monthly cost of shared services | $ 5.0 |  | 7.0 | 5.0 |  |  |  |
GenOn | Restructuring Support Agreement |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Costs expected to be spent |  |  | 261.3 | 261.3 | 261.3 |  |  |
Liability for estimated pension benefit obligations |  |  | 92.0 | 92.0 | 92.0 |  |  |
GenOn | Settlement Consideration | Restructuring Support Agreement |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Due to Affiliate |  |  | 261.3 | 261.3 | 261.3 |  |  |
GenOn | Services Agreement | Restructuring Support Agreement |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Due to Affiliate |  |  | $ 28.0 | $ 28.0 | $ 28.0 |  |  |
GenOn Senior Notes Due in 2017 |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage | 7.875% |  |  |  |  |  |  |
GenOn senior notes, due 2018 |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage | 9.50% |  |  |  |  |  |  |
GenOn senior notes, due 2020 |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage | 9.875% |  |  |  |  |  |  |
GenOn Americas Generation Senior Notes Due in 2021 |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage | 8.50% |  |  |  |  |  |  |
GenOn Americas Generation senior notes, due 2031 |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage | 9.125% |  |  |  |  |  |  |

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