Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Inventoried costs	$ 56	$ 87
Compensation and benefits	147	143
Pension and postretirement benefits	354	402
Loss carryforwards	12	15
Tax credit carryforwards	6	10
Other	79	80
Gross deferred tax assets	654	737
Less: valuation allowance	(9)	(9)
Net deferred tax assets	645	728
Deferred tax liabilities:
Goodwill and other intangible assets	(675)	(728)
Income recognition on contracts in process	(36)	(39)
Property, plant and equipment	(94)	(93)
Other	(56)	(88)
Gross deferred tax liabilities	(861)	(948)
Total net deferred tax liabilities	$ (216)	$ (220)