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Partnerships and Joint Ventures - Unconsolidated Partnerships and Joint Ventures and Equity Method Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Partnerships and Joint Ventures      
Investments in unconsolidated partnerships and joint ventures under equity method $ 726 $ 454  
Balance Sheet Information:      
Current assets 3,700 3,500  
Noncurrent assets 1,700 1,300  
Current liabilities 2,100 3,000  
Noncurrent liabilities 1,700 628  
Income Statement Information:      
Revenue 1,500 1,600 $ 961
Direct cost 1,400 1,500 926
Net earnings $ 26 $ 30 $ 14