Percentage-of-Completion Contracts (Details) - IRAQ - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Billed and Unbilled Contract Claims Subject to Uncertainty [Line Items]
Loss on Contracts	$ 82	$ 44	$ 69	$ 34	$ 10	$ 2	$ 26	$ 153	$ 72	$ 232
Total Estimated Loss on Contracts	532			379				532	379	307
Accounts Receivable, Unapproved Contract Claims	116			90				116	90	36
Deductions (Charges)	28			24				28	24	$ 82
Unapproved Change Orders, Amount	32			80				32	80
ChangeOrdersApprovedbyCustomer									26
Costs in Excess of Billings, Current	$ 6			$ 128				$ 6	$ 128