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DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Effect of Foreign Currency Exchange Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Gains (losses) recognized in AOCI $ 42 $ (52) $ 104 $ (28)
Gains (losses) reclassified from AOCI into product sales (21) 12 (69) 57
Gains (losses) recognized in Other income (expense), net $ 5 $ (13) $ 24 $ (10)