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Investments in Unconsolidated Entities - Summarized Financial Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Combined summarized financial information for unconsolidated entities      
Current assets $ 652 $ 357  
Noncurrent assets 7,264 4,861  
Current liabilities 298 170  
Noncurrent liabilities 26 30  
Revenues 1,469 1,235 $ 938
Operating income 994 824 650
Net income $ 995 $ 824 $ 640