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Investments in Unconsolidated Entities - Summarized Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Combined summarized financial information for unconsolidated entities |  |  |
Current assets | $ 311 | $ 303 |
Noncurrent assets | 4,162 | 3,558 |
Current liabilities | 129 | 241 |
Noncurrent liabilities | 41 | 162 |
Revenues | 938 | 802 | $ 769
Operating income | 650 | 469 | 441
Net income | $ 640 | $ 452 | $ 424

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