FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Cross-currency Swaps, Effect of Hedging Instruments on Financial Instruments (Details) - Net Investment Hedging - Cross-currency swaps - Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in Other Comprehensive Loss	$ 5	$ 5
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain excluded from assessment of hedge effectiveness	$ 3	$ 3