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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	Mar. 31, 2014	Dec. 31, 2013
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 8,521	$ 7,608
Estimated earnings	3,909	3,553
Costs and estimated earnings on uncompleted contracts, Gross	12,430	11,161
Less: Billings to date	12,989	11,393
Total net estimate billing on uncompleted contracts	(559)	(232)
Costs and estimated earnings in excess of billings on uncompleted contracts	1,520	1,539
Billings in excess of costs and estimated earnings on uncompleted contracts	(2,079)	(1,771)
Total net estimate billing on uncompleted contracts	$ (559)	$ (232)

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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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