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Acquisitions, Discontinued Operations and Dispositions - GenOn Settlement and Plan Confirmation (Details) - USD ($) $ in Millions | Jul. 16, 2018 | Apr. 27, 2018 | Dec. 14, 2018
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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 facility |  | $ 38 |
Services Agreement | GenOn | Restructuring Support Agreement |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Collateral posted | $ 15 |  |
GenOn |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Settlement consideration | 261 |  |
Deduction for GenOn tax losses |  |  | $ 9,500
Professional fees |  | $ 6 |
GenOn | Restructuring Support Agreement |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Settlement payment | 125 |  |
GenOn | Services Agreement | Restructuring Support Agreement |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Credit applied | 28 |  |
Remaining payments and other balances due under settlement agreement | 10 |  |
GenOn | Revolving Credit Facility Borrowings | Restructuring Support Agreement |  |  |
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 |  |
GenOn | Accrued Interest On Borrowings | Restructuring Support Agreement |  |  |
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 |  |
GenOn | 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 under settlement agreement | 4 |  |
GenOn | 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 under settlement agreement | 8 |  |
GenOn | Other | Restructuring Support Agreement |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Remaining payments and other balances due under settlement agreement | $ 2 |  |

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