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Claims and Accounts Receivable (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2013
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Claims receivable   $ 576 $ 570
Performance Bond Recovery Including Interest $ 26    
Engineering and Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Claims receivable   425 425
Government Services [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Claims receivable   151 $ 145
Pemex [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of judgment awarded to enterprise 465    
Performance Bond Recovery Including Interest $ 106    
Claims and Account Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Claims receivable   $ 401