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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Disclosure Of Associates And Joint Ventures [Line Items] |  |
Assets | $ 41,465 | $ 36,580
Total liabilities | (25,232) | (21,912)
Associates and Joint Ventures |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Assets | 36,732 | 33,043
Total liabilities | (19,206) | (16,570)
Total Net Assets | $ 17,526 | $ 16,473

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