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GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2020
Intangible Assets [Line Items]            
Aggregate amortization expense related to finite-lived intangible assets $ 445   $ 441 $ 1,300 $ 1,300  
In-process research and development impairment $ 0   $ 0 2,700 $ 0  
In Process Research And Development Trodelvy For HR+/HER2-            
Intangible Assets [Line Items]            
Indefinite-lived intangible assets, fair value   $ 6,100        
In Process Research And Development Trodelvy For HR+/HER2- | Fair Value, Nonrecurring            
Intangible Assets [Line Items]            
In-process research and development impairment   2,700   2,700    
MYR GmbH            
Intangible Assets [Line Items]            
Decrease in goodwill   $ 18   $ 18    
Immunomedics | In Process Research And Development Trodelvy For HR+/HER2-            
Intangible Assets [Line Items]            
Indefinite-lived intangible assets           $ 8,800
Immunomedics | In Process Research And Development Trodelvy For HR+/HER2- | Discount Rate            
Intangible Assets [Line Items]            
Discount rate, measurement input   6.75%