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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 7,515	$ 5,731
Estimated earnings	3,537	3,160
Costs and estimated earnings on uncompleted contracts, Gross	11,052	8,891
Less: Billings to date	10,965	8,855
Total net estimate billing on uncompleted contracts	87	36
Costs and estimated earnings in excess of billings on uncompleted contracts	1,640	1,225
Billings in excess of costs and estimated earnings on uncompleted contracts	(1,553)	(1,189)
Total net estimate billing on uncompleted contracts	$ 87	$ 36

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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