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
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in Other comprehensive loss	$ 41	$ 73
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain excluded from assessment of hedge effectiveness	$ 6	$ 6