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Investments in Affiliates (Summarized Balance Sheet Information) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Investment In Affiliates [Abstract] |  |
Current assets | $ 720 | $ 632
Property, plant and equipment, net | 9,982 | 10,213
Other assets | 2,618 | 2,649
Total assets | 13,320 | 13,494
Current Liabilities | 1,358 | 841
Non-current liabilities | 7,583 | 7,950
Equity | 4,379 | 4,703
Total liabilities and equity | $ 13,320 | $ 13,494

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