Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Inventoried costs	$ 33	$ 34
Compensation and benefits	113	100
Pension and postretirement benefits	444	367
Loss carryforwards	20	18
Tax credit carryforwards	9	10
Other	47	68
Gross deferred tax assets	666	597
Less: valuation allowance	(19)	(14)
Net deferred tax assets	647	583
Deferred tax liabilities:
Goodwill and other intangible assets	657	593
Income recognition on contracts in process	72	47
Property, plant and equipment	71	85
Long-term debt-CODES	73	61
Other	7
Gross deferred tax liabilities	880	786
Total net deferred tax liabilities	$ (233)	$ (203)