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Investments in Unconsolidated Entities - Summarized Financial Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Combined summarized financial information for unconsolidated entities      
Current assets $ 303 $ 365  
Noncurrent assets 3,558 2,901  
Current liabilities 241 231  
Noncurrent liabilities 162 184  
Revenues 802 769 $ 531
Operating income 469 441 301
Net income $ 452 $ 424 $ 285