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Partnerships and Joint Ventures - Ownership and Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Partnership | Majority    
Variable interest entity information    
Entity's interest in partnership or joint venture (as a percent) 50.00%  
Joint ventures | Majority    
Variable interest entity information    
Entity's interest in partnership or joint venture (as a percent) 50.00%  
Unconsolidated variable interest entities | Accounts and notes receivable, net    
Variable interest entity information    
Receivables related to work performed for unconsolidated partnerships and joint ventures $ 83 $ 392
Notes receivable $ 22  
Unconsolidated variable interest entities | Other assets    
Variable interest entity information    
Notes receivable   $ 19