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Income Taxes (Details Textuals) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes Of Non Us Subsidiaries [Line Items] |  |  |  |
Benefits related to the realization of certain foreign tax credits | $ 156.0 |  |  |
Decrease in tax rate related to the realization of certain foreign tax credits | 2.10% |  |  |
Income Taxes [Line items] |  |  |  |
U.S. statutory federal income tax rate | 35.00% | 35.00% | 35.00% |
Income taxes paid | $ 1,400.0 | $ 3,000.0 | $ 3,400.0 |
Unrecognized tax benefits | 821.4 | 974.0 | 870.0 | $ 909.0
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax | 324.0 |  |  |
Unrecognized tax benefits that affect effective tax rate | 723.0 | 516.0 | 502.0 |
Unrecognized tax benefits income tax penalties and interest expense | (90.0) | (9.0) | (38.0) |
Unrecognized tax benefits income tax penalties and interest accrued | 83.0 | 173.0 |  |
Tax positions related to prior years | (289.0) | $ (81.0) | $ (256.0) |
U.S. Tax Act Discrete Net Charge | 2,600.0 |  |  |
U.S. Tax Act Deemed Repatriation of Taxes | 1,703.0 |  |  |
U.S. Tax Act Deferred Tax on distribution of foreign subs earnings | 300.0 |  |  |
U.S. Tax Act Remeasurement Of Deferred Tax Assets and Liabilities | 600.0 |  |  |
Additional Tax Deductions pending approval from IRS | 2,600.0 |  |  |
Tax Benefits pending approval from IRS | $ 360.0 |  |  |
Tax Year 2018 [Member] |  |  |  |
Income Taxes [Line items] |  |  |  |
U.S. statutory federal income tax rate | 21.00% |  |  |
Internal Revenue Service (IRS) [Member] | Earliest Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Open tax years by major tax jurisdiction | 2008 |  |  |
Internal Revenue Service (IRS) [Member] | Latest Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Open tax years by major tax jurisdiction | 2014 |  |  |

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