Income Taxes (Significant Components Of Deferred Tax Assets Net Of Deferred Tax Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	$ 2,413	[1]	$ 3,141	[1]
Inventory and long-term contract methods of income recognition, fixed assets and other, valuation allowance	27		27
Net operating loss, credit and capital loss carryovers, valuation allowance	94		74
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2031	201
Deferred tax asset for net operating loss and credit carryovers indefinitely	106
Retiree Health Care Accruals [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	2,867		2,820
Inventory And Long-Term Contract Methods Of Income Recognition, Fixed Assets And Other [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	(7,151)		(5,189)
Partnerships And Joint Ventures [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	(162)		(228)
Other Employee Benefits Accruals [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	1,427		1,352
In-Process Research And Development Related To Acquisitions [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	37		51
Net Operating Loss, Credit And Capital Loss Carryovers [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	307		488
Pension Asset [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	6,232		5,315
Customer And Commercial Financing [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	(1,078)		(1,471)
Unremitted Earnings Of Non-U.S. Subsidiaries [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	(49)		(66)
Other Net Unrealized Losses [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	$ (17)		$ 69

[1] Of the deferred tax asset for net operating loss and credit carryovers, $201 expires in years ending from December 31, 2013 through December 31, 2032 and $106 may be carried over indefinitely.