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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

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