FINANCIAL INSTRUMENTS - AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax	$ (204)	$ 4
Gain (loss) expected to be reclassified to income in one year or less	0
Foreign currency | Net Investment Hedging
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax	3	5
Gain (loss) expected to be reclassified to income in one year or less	0
Cross-currency swaps | Net Investment Hedging
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax	(139)	16
Gain (loss) expected to be reclassified to income in one year or less	0
Foreign currency denominated debt | Net Investment Hedging
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax	(68)	$ (17)
Gain (loss) expected to be reclassified to income in one year or less	$ 0