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OTHER (INCOME) EXPENSE, NET - Summary of Other Expense, Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Income and Expenses [Abstract]        
Litigation and other matters $ (212) $ 4 $ 320 $ 127
Acquisition-related contingent consideration 8 2 8 26
Loss (gain) on sale of assets, net 21 0 (2) (1)
Acquired in-process research and development costs 0 12 3 20
Other expense (income), net $ (183) $ 18 $ 329 $ 172