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Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current $ 689 $ 602
Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 75 53
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 614 549
Engineering and Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 435 453
Engineering and Construction [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 67 51
Engineering and Construction [Member] | Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 368 402
Technology and Consulting [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 58 70
Technology and Consulting [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 3 0
Technology and Consulting [Member] | Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 55 70
Government Services [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 193 77
Government Services [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 5 2
Government Services [Member] | Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 188 75
Other Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 3 2
Other Segment [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 0 0
Other Segment [Member] | Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 3 2
Non-strategic Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 19 26
Non-strategic Business [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 5 9
Non-strategic Business [Member] | Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 14 17
Operating Segments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 708 628
Operating Segments [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 80 62
Operating Segments [Member] | Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current $ 628 $ 566