Components of Federal and Foreign Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Deferred tax assets related to:
Accrued compensation and benefits	$ 965		$ 918
Pensions	4,317	[1]	3,198	[1]
Other postretirement benefit obligations	386		316
Contract accounting methods	989		721
Foreign company operating losses and credits	59		52
Other	198		223
Valuation allowance	(9)	[2]	(8)	[2]
Deferred tax assets, net	6,905		5,420
Deferred tax liabilities related to:
Goodwill and purchased intangibles	454		410
Property, plant, and equipment	514		575
Exchanged debt securities and other	485	[3]	502	[3]
Deferred tax liabilities	1,453		1,487
Net deferred tax assets	$ 5,452	[4]	$ 3,933	[4]

[1] The increase in 2014 was primarily due to using a lower discount rate for the annual measurement adjustment related to our postretirement benefit plans (Note 9).

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

[3] Includes deferred taxes associated with the exchange of debt securities in prior years.

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