Provision for Income Taxes (Schedule of Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Assets
Deferred tax assets, depreciation	$ 0	$ 0
Deferred tax assets, accrued employee benefits	4,812	5,376
Deferred tax assets, other accrued expenses	563	555
Deferred tax assets, inventories	125	151
Deferred tax assets, unrealized exchange gains/losses	0	0
Deferred tax assets,tax loss/tax credit carryforwards/backs	2,124	2,409
Deferred tax assets, investments in subsidiaries and affiliates	133	151
Deferred tax assets, amortization of intangibles	187	154
Deferred tax assets, other	215	258
Valuation Allowance	(1,529)	(1,704)
Deferred tax assets, net of valuation allowance	6,630	7,350
Net deferred tax asset	3,418	3,633
Liabilities [Abstract]
Deferred tax liabilities, depreciation	953	1,003
Deferred tax liabilities, accrued employee benefits	374	746
Deferred tax liabilities, other accrued expenses	0	0
Deferred tax liabilities, inventories	99	137
Deferred tax liabilities, unrealized exchange gains/losses	224	173
Deferred tax liabilities, tax loss/tax credit carryforwards/backs	0	0
Deferred tax liabilities, investments in subsidiaries and affiliates	154	195
Deferred tax liabilities, amortization of intangibles	1,331	1,353
Deferred tax liabilities, other	77	110
Deferred tax liabilities	$ 3,212	$ 3,717