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Claims and Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected after Next Twelve Months $ 528 $ 526
Engineering and Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected after Next Twelve Months 400 400
Government Services [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected after Next Twelve Months 128 126
Government Services [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Government Contract Receivable 83 83
Disputed costs $ 45 $ 43