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