FINANCIAL INSTRUMENTS - Other comprehensive income (Loss) (Details) - Net Investment Hedging - Other comprehensive income (loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Foreign currency
Derivative Instruments, Gain (Loss) [Line Items]
Gains and (losses) on derivative instruments	$ (2)	$ 1	$ 2
Cross-currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gains and (losses) on derivative instruments	(155)	4	12
Foreign currency denominated debt
Derivative Instruments, Gain (Loss) [Line Items]
Gains and (losses) on derivative instruments	$ (51)	$ 13	$ 27