Income Taxes (Details Textuals) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
U.S. statutory federal income tax rate		21.00%	21.00%	35.00%
Benefits related to the realization of certain foreign tax credits				$ 156
Decrease in tax rate related to the realization of certain foreign tax credits				2.10%
U.S. Tax Act discrete net charge	$ 2,600			$ 2,600
Aggregate state income and foreign withholding taxes on foreign earnings		$ 100
Income taxes paid		1,700	$ 2,000	1,400
Tax positions related to prior years		(14)	(74)	(289)
Accumulated earnings intended to be permanently reinvested outside the U.S.		700
Unrecognized tax benefits	821	726	701	821	$ 974
Unrecognized tax benefits that affect effective tax rate	$ 723	623	599	723
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax		113
Unrecognized tax benefits that, if recognized, could impact effective tax rate		96
Unrecognized tax benefits income tax penalties and interest expense		5	(18)	(90)
Income tax examination penalties and interest benefit				$ 56
Unrecognized tax benefits income tax penalties and interest accrued		$ 70	$ 65
Earliest Year [Member]
Income Tax Contingency [Line Items]
Tax audit settlement years		2008
Latest Year [Member]
Income Tax Contingency [Line Items]
Tax audit settlement years		2014