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FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
$ in Billions
Jun. 30, 2019
Dec. 31, 2018
Foreign exchange derivatives    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Notional amount of foreign exchange derivatives $ 7.9 $ 7.2
Interest rate derivatives    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Notional amount of foreign exchange derivatives $ 5.1 $ 5.4