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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 8,132	$ 9,082
Estimated earnings	3,869	4,080
Costs and estimated earnings on uncompleted contracts, Gross	12,001	13,162
Less: Billings to date on uncompleted contracts	11,776	12,697
Total net estimate billing on uncompleted contracts	225	465
Costs and estimated earnings in excess of billings on uncompleted contracts	665	1,250
Billings in excess of costs and estimated earnings on uncompleted contracts	(440)	(785)
Total net estimate billing on uncompleted contracts	$ 225	$ 465

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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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