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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Disclosure Of Associates And Joint Ventures [Line Items] |  |
Assets | $ 28,830 | $ 29,477
Total liabilities | (16,554) | (16,003)
Associates and Joint Ventures |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Assets | 31,412 | 40,375
Total liabilities | (15,950) | (20,575)
Total Net Assets | $ 15,462 | $ 19,800

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