Components of Federal and Foreign Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Deferred tax assets related to:
Accrued compensation and benefits	$ 909		$ 843
Pensions	5,117		4,578
Other postretirement benefit obligations	433		487
Contract accounting methods	853		806
Sale of discontinued operations			69
Foreign company operating losses and credits	34		31
Other	284		305
Valuation allowance	(8)	[1]	(14)	[1]
Deferred tax assets, net	7,622		7,105
Deferred tax liabilities related to:
Goodwill and purchased intangibles	402		369
Property, plant, and equipment	604		638
Exchanged debt securities and other	544	[2]	379	[2]
Deferred tax liabilities	1,550		1,386
Net deferred tax assets	$ 6,072	[3]	$ 5,719	[3]

[1] A valuation allowance has been provided against certain foreign company deferred tax assets arising from carryforwards of unused tax benefits.

[2] Includes deferred taxes associated with the exchange of debt securities in 2012 (Note 8) and prior years.

[3] Includes net foreign current deferred tax liabilities, which are included on the Balance Sheets in other current liabilities.