Income Taxes (Significant Components Of Deferred Tax Assets Net Of Deferred Tax Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Valuation Allowance [Line Items]
Inventory and long-term contract methods of income recognition		$ (10,401)	$ (10,156)
Pension benefits		6,303	6,145
Retiree health care benefits		2,513	2,572
Fixed assets, intangibles and goodwill (net of valuation allowance $16 and $18)		(1,837)	(1,782)
Other employee benefits		1,339	1,477
Customer and commercial financing		(777)	(853)
Accrued expenses and reserves		609	733
Net operating loss, credit and capital loss carryovers (net of valuation allowance of $89 and $63)(1)	[1]	216	266
Other		(92)	(292)
Net deferred tax (liabilities)/assets(2)	[2]	2,127	1,890
Valuation Allowance - Fixed assets, intangibles, and goodwill deferred tax assets		105	81
Valuation Allowance - Net operating loss, credit and capital loss carryovers		89	63
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2035		208
Deferred tax asset for net operating loss and credit carryovers indefinitely		8
Deferred tax assets related to Accumulated other comprehensive loss		7,277	8,007
Valuation Allowance, Property Plant and Equipment, Intangibles and Goodwill [Member]
Valuation Allowance [Line Items]
Valuation Allowance - Fixed assets, intangibles, and goodwill deferred tax assets		$ 16	$ 18

[1] Of the deferred tax asset for net operating loss and credit carryovers, $208 expires in years ending from December 31, 2016 through December 31, 2035 and $8 may be carried over indefinitely.

[2] Included in the net deferred tax (liabilities)/assets as of December 31, 2015 and 2014 are deferred tax assets in the amounts of $7,277 and $8,007 related to Accumulated other comprehensive loss.