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Related Party Transactions and Former Parent Company Equity (Details) (Northrop Grumman, Former Parent, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Pre-Spin-Off	Dec. 31, 2010 Pre-Spin-Off	Dec. 31, 2011 Pre-Spin-Off Management and Support Services	Dec. 31, 2010 Pre-Spin-Off Management and Support Services	Dec. 31, 2011 Pre-Spin-Off Shared Services and Infrastructure Costs	Dec. 31, 2010 Pre-Spin-Off Shared Services and Infrastructure Costs	Dec. 31, 2011 Pre-Spin-Off Provided Benefits	Dec. 31, 2010 Pre-Spin-Off Provided Benefits	Dec. 31, 2012 Post-Spin-Off Transition Services Agreement	Dec. 31, 2011 Post-Spin-Off Transition Services Agreement
Related Party Transaction
Cost of enterprise shared services, benefit support services and other specifed services			$ 32	$ 115	$ 80	$ 325	$ 169	$ 725	$ 20	$ 75
Purchases of certain products and services from affiliates	44	97
Sales of certain products and services from affiliates	$ 1	$ 8

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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