DERIVATIVE FINANCIAL INSTRUMENTS - Components of the Gain or Loss on Derivatives that Quality as a Cash Flow Hedging Relationship (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of gains (losses) reclassified from accumulated other comprehensive income (loss) in the next twelve months	$ 1
Cash flow hedges
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives	2	$ (6)
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss)	0	(1)
Amount and Location of Gains (Losses) Recognized in Income (Loss) on Derivatives	0	0
Cash flow hedges | Foreign currency swaps
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives	2	(5)
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss)	0	0
Amount and Location of Gains (Losses) Recognized in Income (Loss) on Derivatives	$ 0	0
Cash flow hedges | Interest rate swaps
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives		(1)
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss)		(1)
Amount and Location of Gains (Losses) Recognized in Income (Loss) on Derivatives		$ 0