Income Taxes (Significant Components Of Deferred Tax Assets Net Of Deferred Tax Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Valuation Allowance [Line Items]
Inventory and long-term contract methods of income recognition		$ (9,954)	$ (10,401)
Pension benefits		7,385	6,303
Retiree health care benefits		2,268	2,513
Fixed assets, intangibles and goodwill (net of valuation allowance $16 and $16)		(2,007)	(1,837)
Other employee benefits		1,225	1,339
Customer and commercial financing		(730)	(777)
Accrued expenses and reserves		587	609
Net operating loss, credit and capital loss carryovers (net of valuation allowance of $79 and $89)(1)	[1]	277	216
Other		(57)	(92)
Net deferred tax (liabilities)/assets(2)	[2]	1,006	2,127
Valuation Allowance - Fixed assets, intangibles, and goodwill deferred tax assets		95	105
Valuation Allowance - Net operating loss, credit and capital loss carryovers		79	89
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2035		262
Deferred tax asset for net operating loss and credit carryovers indefinitely		15
Deferred tax assets related to Accumulated other comprehensive loss		7,701	7,277
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	$ 16

[1] Of the deferred tax asset for net operating loss and credit carryovers, $262 expires on or before December 31, 2036 and $15 may be carried over indefinitely.

[2] Included in the net deferred tax (liabilities)/assets as of December 31, 2016 and 2015 are deferred tax assets in the amounts of $7,701 and $7,277 related to Accumulated other comprehensive loss.