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Taxes (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2018 | Dec. 31, 2014
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Increase in income tax provision |  | $ 1,200 |  |  |  |
Effective tax rate absent the impact from the Tax Act |  | 35.90% |  |  |  |
Effective income tax rate (percent) |  | (108.00%) | 33.10% | 35.30% |  |
Impairment | $ 800 |  | $ 800 |  |  |
Goodwill, Impairment Loss, Non-deductible Portion |  |  | 433 |  |  |
Unrecognized tax benefits |  | $ 80 | $ 84 | $ 34 |  | $ 34
Unrecognized tax benefits that would impact future tax rates |  | 24 |  |  |  |
Unrecognized tax benefits, portion expected to be resolved in the next fiscal year |  | 2 |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 0 |  |  |  |
Federal |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Operating loss carryforwards, not subject to expiration |  | 39 |  |  |  |
Federal | Begin To Expire in 2031 |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Pre-tax net operating loss carryforwards for state and local income tax purposes |  | 4,300 |  |  |  |
Operating loss carryforwards, subject to expiration |  | 908 |  |  |  |
State and Local |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Operating loss carryforwards valuation allowance |  | 246 |  |  |  |
Pre-tax net operating loss carryforwards for state and local income tax purposes |  | 10,500 |  |  |  |
Operating loss carryforwards, subject to expiration |  | 496 |  |  |  |
Pre-tax net operating loss carryforwards expected to utilized |  | 1,800 |  |  |  |
Operating loss carryforwards expected to utilized, net of tax |  | 81 |  |  |  |
FES |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Increase in income tax provision |  | $ 1,100 |  |  |  |
Effective tax rate absent the impact from the Tax Act |  | 36.80% |  |  |  |
Effective income tax rate (percent) |  | (14.10%) | 35.40% | 44.20% |  |
Impairment | $ 23 |  | $ 23 |  |  |
Unrecognized tax benefits |  | $ 0 | $ 0 | $ 8 |  | $ 3
FES | Federal | Begin To Expire in 2031 |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Pre-tax net operating loss carryforwards for state and local income tax purposes |  | 2,000 |  |  |  |
Operating loss carryforwards, subject to expiration |  | 429 |  |  |  |
FES | State and Local |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Operating loss carryforwards valuation allowance |  | 151 |  |  |  |
Pre-tax net operating loss carryforwards for state and local income tax purposes |  | 3,700 |  |  |  |
Operating loss carryforwards, subject to expiration |  | 154 |  |  |  |
Pre-tax net operating loss carryforwards expected to utilized |  | 2 |  |  |  |
Forecast |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  |  | $ 45 |
Regulated Distribution |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |
Excess deferred taxes |  | $ 2,300 |  |  |  |

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