Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Decrease in income tax expense	$ 1,861
Income tax expense (benefit)	$ (1,729)	$ 132	$ 11,892
Effective tax rate	80.00%	2.70%	38.10%
Deferred tax asset, increase	$ 3,700
Loss carry forward	16,538
Tax credit carryforward	1,423
Carry forward amount of foreign tax credit with expiration dates	10,976	$ 10,534
Undistributed earnings of international consolidated subsidiaries and affiliates for which no deferred income tax provision has been made for future remittances	$ 46,400
Percentage of impact of unrecognized tax benefits on effective tax rate if subsequently recognized	74.00%
Unrecognized tax benefits	$ 3,031	3,042	$ 3,552	$ 3,848
Income tax accruals for anticipated interest and penalty obligations	424	399
Income tax benefit expense associated with interest and penalties	$ 38	195	$ 4
New Accounting Pronouncement, Early Adoption, Effect [Member] | Prepaid Expenses and Other Current Assets [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income tax assets, net		(917)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Deferred charges and other assets [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income tax assets, net		(603)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accrued Income Taxes Current [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income tax liabilities, net		(996)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Deferred Tax Liabilities, Net, Noncurrent [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income tax liabilities, net		$ (524)