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Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes (Textuals) [Abstract] |  |  |  |  |
Effective income tax rate (percent) |  | 19.10% | 32.40% | 120.30% |
Remeasurement of deferred taxes |  | $ 0 | $ 24 | $ 1,193 |
Valuation allowances |  | 5 | 21 | 11 |
Unrecognized tax benefits |  | 164 | 158 | 80 | $ 84
Increase resulting from nondeductible interest |  | 14 |  |  |
Reserves on worthless stock deduction |  | 6 |  |  |
Decrease resulting from nondeductible interest |  |  | 11 |  |
Decrease for lapse in statute |  | 4 | 2 | $ 6 |
Unrecognized tax benefits that would impact future tax rates |  | 151 |  |  |
Unrecognized tax benefits, portion expected to be resolved in the next fiscal year |  | 59 |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 57 |  |  |
Federal |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |
Operating loss carryforwards, not subject to expiration |  | 9 |  |  |
Federal | Begin To Expire in 2031 |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |
Pre-tax net operating loss carryforwards |  | 2,100 |  |  |
Operating loss carryforwards, subject to expiration |  | 441 |  |  |
State and Local |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |
Pre-tax net operating loss carryforwards |  | 6,800 |  |  |
Operating loss carryforwards, subject to expiration |  | 361 |  |  |
Pre-tax net operating loss carryforwards expected to utilized |  | 1,500 |  |  |
Operating loss carryforwards expected to utilized, net of tax |  | 103 |  |  |
Tax deferred expense, net of tax |  | $ 62 |  |  |
Decrease for lapse in statute |  |  | $ 3 |  |
West Virginia | State and Local |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |
Valuation allowances | $ 126 |  |  |  |

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