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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
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