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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 6,395	$ 8,132
Estimated earnings	3,023	3,869
Costs and estimated earnings on uncompleted contracts, Gross	9,418	12,001
Less: Billings to date on uncompleted contracts	9,202	11,776
Total net estimate billing on uncompleted contracts	216	225
Costs and estimated earnings in excess of billings on uncompleted contracts	495	665
Billings in excess of costs and estimated earnings on uncompleted contracts	(279)	(440)
Total net estimate billing on uncompleted contracts	$ 216	$ 225

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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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