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Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current $ 602 $ 726
Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 53 50
Trade & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 549 676
Technology and Consulting [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 70 51
Technology and Consulting [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 0 0
Technology and Consulting [Member] | Trade & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 70 51
Engineering and Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 453 583
Engineering and Construction [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 51 45
Engineering and Construction [Member] | Trade & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 402 538
Government Services [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 77 89
Government Services [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 2 5
Government Services [Member] | Trade & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 75 84
Other Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 2 3
Other Segment [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 0 0
Other Segment [Member] | Trade & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 2 3
Non-strategic Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 26 121
Non-strategic Business [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 9 48
Non-strategic Business [Member] | Trade & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 17 73
Operating Segments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 628 847
Operating Segments [Member] | Retainage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current 62 98
Operating Segments [Member] | Trade & Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Account receivable, current $ 566 $ 749