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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 10,905	$ 10,442
Estimated earnings	4,868	4,699
Costs and estimated earnings on uncompleted contracts, Gross	15,773	15,141
Less: Billings to date	15,284	15,038
Total net estimate billing on uncompleted contracts	489	103
Costs and estimated earnings in excess of billings on uncompleted contracts	1,669	1,878
Billings in excess of costs and estimated earnings on uncompleted contracts	(1,180)	(1,775)
Total net estimate billing on uncompleted contracts	$ 489	$ 103

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Net Estimate Billing On Uncompleted Contracts.

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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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