DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Classification and Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 9	$ 11
Derivative liability, fair value	8	19
Derivative instruments designated as hedges
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	7	0
Derivative liability, fair value	2	17
Derivative instruments designated as hedges | Foreign exchange contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	7	0
Derivative instruments designated as hedges | Foreign exchange contracts | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	2	17
Undesignated derivative instruments | Foreign exchange contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	2	11
Undesignated derivative instruments | Foreign exchange contracts | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 6	$ 2