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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Disclosure Of Associates And Joint Ventures [Line Items] |  |
Assets | $ 60,278 | $ 61,331
Total liabilities | (38,827) | (39,658)
Associates and Joint Ventures |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Assets | 54,607 | 54,673
Total liabilities | (32,536) | (28,216)
Total Net Assets | $ 22,071 | $ 26,457

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