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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain recognized in Other comprehensive income (loss)	$ (54)	$ 5	$ 1	$ 5
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain excluded from assessment of hedge effectiveness	$ 6	$ 3	$ 17	$ 3