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FAIR VALUE OF FINANCIAL INSTRUMENTS - Netting of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounts payable and other    
Disclosure of offsetting of financial liabilities [line items]    
Gross amounts of financial instruments before netting $ 1,873 $ 2,124
Gross amounts of financial instruments set-off in Consolidated Balance Sheets (250) (267)
Net amount of financial instruments in Consolidated Balance Sheets 1,623 1,857
Accounts receivable and other    
Disclosure of offsetting of financial assets [line items]    
Gross amounts of financial instruments before netting 2,367 1,605
Gross amounts of financial instruments set-off in Consolidated Balance Sheets (254) (223)
Net amount of financial instruments in Consolidated Balance Sheets $ 2,113 $ 1,382