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Claims and Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Claims receivable $ 526 $ 570
Engineering and Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Claims receivable 400 425
Government Services [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Claims receivable $ 126 $ 145