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FINANCIAL INSTRUMENTS - Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Foreign currency | Derivatives not designated as hedging instruments: | Selling, general and administrative expenses        
Derivative [Line Items]        
Gain (loss) on derivatives not designated as hedges $ 6 $ (1) $ 11 $ 2