Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income before income tax including related corporate and other charges for U.S. operations	$ (2,877)	$ 6,296	$ 4,672
Income before income tax for international operations	7,719	24,906	31,233
Income tax credits and adjustments	$ 35	$ 68	$ 175
Effective tax rate	2.70%	38.10%	39.90%
Approximate decrease in deferred tax liabilities	$ 700
Loss carry forward	7,615
Tax credit carryforward	1,249
Carry forward amount of foreign tax credit with expiration dates	10,534	$ 11,867
Undistributed earnings of international consolidated subsidiaries and affiliates for which no deferred income tax provision has been made for future remittances	$ 45,400
Percentage of impact of unrecognized tax benefits on effective tax rate if subsequently recognized	71.00%
Unrecognized tax benefits	$ 3,042	3,552	$ 3,848	$ 3,071
Income tax accruals for anticipated interest and penalty obligations	399	233
Income tax benefit expense associated with interest and penalties	$ 195	$ 4	$ (42)