Income Taxes (Significant Components Of Deferred Tax Assets, Net Of Deferred Tax Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	$ 3,141	[1]	$ 3,542	[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	74		78
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2031	336
Deferred tax asset for net operating loss and credit carryovers indefinitely	152
Retiree Health Care Accruals [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	2,820		3,061
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	(5,189)		(2,644)
Partnerships And Joint Ventures [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	(228)		(263)
Other Employee Benefits Accruals [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	1,352		1,272
In-Process Research And Development Related To Acquisitions [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	51		65
Net Operating Loss, Credit And Capital Loss Carryovers [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	488		300
Pension Asset [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	5,315		3,443
Customer And Commercial Financing [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	(1,471)		(1,645)
Unremitted Earnings Of Non-U.S. Subsidiaries [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	(66)		(60)
Other Net Unrealized Losses [Member]
Deferred Tax Assets, Net Of Deferred Tax Liabilities [Line Items]
Net deferred tax assets	$ 69		$ 13

[1] Of the deferred tax asset for net operating loss and credit carryovers, $336 expires in years ending from December 31, 2012 through December 31, 2031 and $152 may be carried over indefinitely.