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DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Effect of Foreign Currency Exchange Contracts (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gains recognized in AOCI $ 78 $ 66
Gains (losses) reclassified from AOCI into product sales (25) 27
Gains recognized in Other income (expense), net $ 34 $ 24