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Income Taxes (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes Of Non Us Subsidiaries [Line Items]        
Accumulated earnings intended to be permanently reinvested outside the U.S. $ 700.0      
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 21.00% 35.00% 35.00%  
Income taxes paid $ 2,000.0 $ 1,400.0 $ 3,000.0  
Unrecognized tax benefits 701.0 821.0 974.0 $ 870.0
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax 151.0      
Unrecognized tax benefits that affect effective tax rate 599.0 723.0 516.0  
Unrecognized tax benefits income tax penalties and interest expense (18.0) (90.0) 9.0  
Unrecognized tax benefits income tax penalties and interest accrued 65.0 83.0    
Tax positions related to prior years (74.0) (289.0) $ (81.0)  
U.S. Tax Act Discrete Net Charge (100.0) 2,600.0    
U.S. Tax Act Deemed Repatriation of Taxes 1,689.0 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    
Unrecognized tax benefits that, if recognized, could impact effective tax rate 127.0      
Aggregate state income and foreign withholding taxes on foreign earnings $ 100.0      
Income Tax Examination Penalties And Interest Benefit   56.0    
Tax Benefits Recognized   $ 289.0    
Earliest Year [Member]        
Income Tax Contingency [Line Items]        
Open tax years by major tax jurisdiction 2015      
Tax Audit Settlement Years 2008      
Latest Year [Member]        
Income Tax Contingency [Line Items]        
Tax Audit Settlement Years 2014