United States Government Contract Work (Details) (USD $)	3 Months Ended					1 Months Ended				3 Months Ended	1 Months Ended			1 Months Ended	28 Months Ended	3 Months Ended	10 Months Ended
	Mar. 31, 2011	Apr. 30, 2008	Mar. 31, 2012 All DCAA Audit Issues [Member]	Mar. 31, 2012 Private Security [Member]	Dec. 31, 2007 Private Security [Member]	Apr. 30, 2008 Containers [Member]	Mar. 31, 2012 Containers [Member]	Mar. 31, 2011 Containers [Member]	Mar. 31, 2012 Dining Facilities [Member]	Mar. 31, 2011 Transportation Costs [Member]	Feb. 29, 2012 Construction Services [Member]	Mar. 31, 2012 Construction Services [Member]	Sep. 30, 2010 Construction Services [Member]	Apr. 30, 2008 First Kuwaiti Trading Company Arbitration [Member]	Feb. 28, 2011 Burn Pit Litigation [Member]	Mar. 31, 2012 Sodium Dichromate Litigation [Member]	Sep. 30, 2009 Sodium Dichromate Litigation [Member]	Mar. 31, 2012 Claims [Member]	Mar. 31, 2011 Fly America Act [Member] Transportation Costs [Member]	Mar. 31, 2011 LogCAP III Contract [Member] Transportation Costs [Member]
United States Government Contract Work [Line Items]
Award fees	$ 16,000,000
Total amount of DCAA Form 1's - Notice of contract costs suspended and/or disapproved issued to the enterprise			352,000,000	103,000,000			51,000,000	25,000,000	124,000,000				25,000,000	51,000,000					6,000,000	27,000,000
DCAA Form 1 total withholding(s) of payments from remittances on contract billings			146,000,000	45,000,000			26,000,000		66,000,000			9,000,000
Total amount of payments withheld from subcontractors as a result of disapproved costs related to DCAA Form 1's issued to the enterprise			64,000,000				30,000,000		25,000,000
Total amount of payment demanded by the DCAA in demand letters issued for disapproved costs related to DCAA Form 1's issued			98,000,000
DCAA Form 1 initial assessment and withholding(s) from remittances on contract billings					20,000,000
Estimated percentage of the total subcontract costs related to the private security costs					6.00%
DCAA Form 1 disapproval of contract costs in addition to the initial assessment					83,000,000
DCAA Form 1 withholding(s) from remittances on contract billings in addition to the initially-withheld amount				25,000,000
Appeal to recover the DCAA Form 1 withhold from remittances on contract billings					44,000,000				55,000,000
Amount of counterclaims filed by the enterprise against a subcontractor						51,000,000
Minimum number of deployment days in the contractor rotation terms under the LogCAP III contract										179
Potentially unallowable costs agreed to allowable											10,000,000
Potentially unallowable costs											15,000,000
Total claim by subcontractor related to leased vehicles														134,000,000
Amount of subcontractor claims that have been subject to arbitration hearings		4
Partial arbitration award to subcontractor for damages														16,000,000
Number of lawsuits the enterprise has been served, minimum															50		five
Number of individual plaintiffs															250	170
Costs incurred for unapproved claims under various government contracts																		192,000,000
Amount of unapproved claims included in accounts receivable																		106,000,000
Amount of unapproved claims included in unbilled receivables on uncompleted contracts																		$ 86,000,000