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Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Summarized Balance Sheet Information of Equity Method Investment [Abstract] |  |
Current assets | $ 376 | $ 449
Non-current assets | 12,033 | 11,995
Current liabilities | 1,270 | 1,615
Non-current liabilities | $ 3,580 | $ 3,211

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