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Discontinued Operations (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 12, 2014 USD ($) plant | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from asset sales | $ 394 | $ 15 | $ 20 | $ 394
Assets held-for-sale | 235 |  |  |
Goodwill | 29 |  |  |
Pre-tax income |  |  |  | 155
Pre-tax gain on sale of assets |  |  |  | 142
Revenue |  |  |  | 5
FES |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from asset sales | 307 | $ 9 | $ 13 | 307
Assets held-for-sale | 122 |  |  |
Goodwill | $ 1 |  |  |
Pre-tax income |  |  |  | 186
Pre-tax gain on sale of assets |  |  |  | 177
Revenue |  |  |  | $ 5
FERC | Hydroelectric Asset Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Application to sell power plant projects, number | plant | 11 |  |  |

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