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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

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