Percentage of Completion Contracts (Details) - IRAQ - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Billed and Unbilled Contract Claims Subject to Uncertainty [Line Items]
Loss on Contracts	$ 52
Total Estimated Loss on Contracts	584	$ 337
Accounts Receivable, Unapproved Contract Claims	116	137
Deductions (Back Charges)	32
Costs in Excess of Billings, Current	$ 2
Contracts Revenue		42
Unapproved Change Orders, Amount		$ 53