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Income Taxes (Details Textual) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized Tax Benefits | $ 36 | $ 33 | $ 31 | $ 26
Deferred Tax Liabilities, Gross | (1,696) | (1,553) |  |
Deferred Tax Liabilities, Property, Plant and Equipment | (1,423) | (1,270) |  |
Deferred Tax Assets, Net of Valuation Allowance | 445 | 441 |  |
Deferred Tax Assets, Valuation Allowance | 31 | 21 |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits | 47 | 35 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (10) |  |  |
Deferred Tax Liabilities, Net | (1,251) | (1,112) |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 31 | 8 | 28 |
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount | 2 | 2 | (4) |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent | 17 | 20 |  |
Deferred Tax Assets, Deferred Income | 127 | 106 |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 0 | 0 | 2 |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 6 | 5 | 6 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | (3) | (3) | (3) |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 161 | 45 | $ 322 |
Deferred Tax Liabilities, Net, Noncurrent | 1,251 | $ 1,112 |  |
Unrecognized tax benefits would impact on effective tax rate | $ 15 |  |  |

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