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Investments in Unconsolidated Entities - Summarized Financial Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Combined summarized financial information for unconsolidated entities      
Current assets $ 357 $ 311  
Noncurrent assets 4,861 4,162  
Current liabilities 170 129  
Noncurrent liabilities 30 41  
Revenues 1,235 938 $ 802
Operating income 824 650 469
Net income $ 824 $ 640 $ 452