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FAIR VALUE OF FINANCIAL INSTRUMENTS - Netting of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts payable and other    
Disclosure of offsetting of financial liabilities [line items]    
Gross amounts of financial instruments before netting $ 2,124 $ 1,186
Gross amounts of financial instruments set-off in Consolidated Balance Sheets (267) (154)
Net amount of financial instruments in Consolidated Balance Sheets 1,857 1,032
Accounts receivable and other    
Disclosure of offsetting of financial assets [line items]    
Gross amounts of financial instruments before netting 1,605 1,625
Gross amounts of financial instruments set-off in Consolidated Balance Sheets (223) (124)
Net amount of financial instruments in Consolidated Balance Sheets $ 1,382 $ 1,501