Provision for Income Taxes (Schedule of Significant Components of Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Asset
Deferred tax assets, depreciation	$ 0	$ 0
Deferred tax asset, accrued employee benefits	5,198	5,562
Deferred tax asset, other accrued expenses	1,157	1,020
Deferred tax asset, inventories	249	199
Deferred tax asset, unrealized exchange gains/losses	0	0
Deferred tax asset, tax loss tax credit carryforwards and backs	2,733	2,854
Deferred tax asset, investment in subsidiaries and affiliates	81	46
Deferred tax asset, amortization of intangibles	58	69
Deferred tax asset, other	270	250
Valuation allowance	(1,914)	(1,971)
Deferred tax asset	7,832	8,029
Net deferred tax asset	3,632	3,631
Liability
Deferred tax liability, depreciation	1,696	1,781
Deferred tax liability, accrued employee benefits	167	252
Deferred tax liability, other accrued expenses	499	354
Deferred tax liability, inventories	68	39
Deferred tax liability, unrealized exchange gains/losses	56	35
Deferred tax liability, tax loss tax credit carryforwards and backs	0	0
Deferred tax liability, investment in subsidiaries and affiliates	92	259
Deferred tax liability, amortization of intangibles	1,335	1,399
Deferred tax liability, other	287	279
Deferred tax liability	$ 4,200	$ 4,398