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INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2020
Intangible Assets [Line Items]            
Aggregate amortization expense related to finite-lived intangible assets $ 598 $ 445   $ 1,700 $ 1,300  
In-process research and development impairment $ 0 $ 0   0 2,700  
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 $ 0 $ 2,700  
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 (as percent)     6.75%