Percentage of Completion Contracts (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Billed and Unbilled Contract Claims Subject to Uncertainty [Line Items]
Unapproved Change Orders, Amount	$ 80								$ 80
ChangeOrdersApprovedbyCustomer									26
Costs in Excess of Billings, Current	128								128
Iraq [Member]
Billed and Unbilled Contract Claims Subject to Uncertainty [Line Items]
Loss on contracts	(34)	(10)	(2)	(26)	148	85	6		72	232	100
Estimated loss on long term construction contract	379				307				379	307
Accounts Receivable, Unapproved Contract Claims	90				36				90	36
Liability for Claims and Claims Adjustment Expense					82					82
Deductions (Charges)	24								24
Revenues								$ 63