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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Foreign Exchange Contracts Included on Consolidated Statements of Operations and Consolidated Statements of Cash Flows (Details) - Foreign currency exchange contracts - Not Designated as Hedging Instrument - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain (loss) related to changes in fair value $ 2 $ 0 $ 7 $ (1)
Loss related to settlements $ (5)   $ (14) $ (1)
Gain related to settlements   $ 3