Income Taxes (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets:
Inventoried costs	$ 27	$ 24
Compensation and benefits	113	104
Pension and postretirement benefits	379	337
Loss carryforwards	19	14
Tax credit carryforwards	10	8
Other	103	113
Gross deferred tax assets	651	600
Less: valuation allowance	(14)	(3)
Net deferred tax assets	637	597
Deferred tax liabilities:
Goodwill and other intangible assets	670	606
Income recognition on contracts in process	102	97
Property, plant and equipment	101	66
Other	50	22
Gross deferred tax liabilities	923	791
Total net deferred tax liabilities	$ (286)	$ (194)