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U.S. Government Matters (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) lawsuits claim	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) lawsuits claim defendent	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 27, 2011 USD ($)	Dec. 31, 2009 lawsuits
United States Government Contract Work [Line Items]
Contract, Direct Claim	$ 240		$ 240
Contract, Indirect Claim	18		18
Contracts Revenue	1,073	$ 1,199	3,078	$ 4,016
All Defense Contract Audit Agency Audit Issues [Member]
United States Government Contract Work [Line Items]
Contract termination claims, US Federal Government	173		173		$ 173
Government Contract Receivable	83		83		83
Total Amount Of Payments Withheld From Subcontractors As Result Of Disapproved Costs Related To Dcaa Form 1 Issued To Enterprise	32		32		32
Contracts Revenue			$ 90		90
Audits [Member]
United States Government Contract Work [Line Items]
DisallowanceRate			99.90%
Reserve For Potentially Disallowable Costs Incurred Under Government Contracts [Member]
United States Government Contract Work [Line Items]
Allowance for Doubtful Accounts Receivable	58		$ 58		$ 50
First Kuwaiti Trading Company Arbitration [Member]
United States Government Contract Work [Line Items]
AmountOwedToSubcontractor	$ 32		32
PaymentsOnContractWork			26			$ 19
Damages awarded, value			$ 17
Burn Pit Litigation [Member]
United States Government Contract Work [Line Items]
Loss Contingency, Pending Claims, Number | lawsuits	60		60
Sodium Dichromate Litigation [Member]
United States Government Contract Work [Line Items]
Loss Contingency, Pending Claims, Number | lawsuits								5
qui tams [Member]
United States Government Contract Work [Line Items]
Loss Contingency, Pending Claims, Number | claim	5		5
Loss Contingency, Number of Active Claims | claim	2		2
Percent of Legal Fees Billable to the U.S. Government			80.00%
Legal Fees			$ 10
Howard qui tam [Member]
United States Government Contract Work [Line Items]
Loss Contingency, Estimate of Possible Loss							$ 628
DOJFCA [Member]
United States Government Contract Work [Line Items]
Loss Contingency, Number of Defendants | defendent			3
Pay-When-Paid Terms [Member] | First Kuwaiti Trading Company Arbitration [Member]
United States Government Contract Work [Line Items]
PaymentsOnContractWork			$ 4

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Pertaining to the individual matter in discussion, amount of payments that the enterprise withheld from its subcontractors under the payment terms of those contracts in relation to the government withhold of payments to the enterprise associated with the DCAA's issuance of Form 1 - Notice of Contract Costs Suspended and/or Disapproved.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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Amount included in accounts receivable for long-term contracts and programs associated with governmental contracts at the balance sheet date representing amounts deemed to be reimbursable items under a terminated United States government contract or subcontract and included in a claim with the United States government, including those associated with terminated war and defense contracts.

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