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OTHER EXPENSE, NET - Summary of Other Expense, Net (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Income and Expenses [Abstract]        
Litigation and other matters $ 532 $ 100 $ 532 $ 123
Acquisition-related contingent consideration 9 11 0 24
Net gain on sale of assets 0 0 (23) (1)
Acquired in-process research and development costs 1 7 3 8
Other expense (income), net $ 542 $ 118 $ 512 $ 154