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INTANGIBLE ASSETS - Summary of Intangible Assets, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount $ 31,884 $ 31,879
Accumulated Amortization (16,614) (14,822)
Foreign Currency Translation Adjustment 0 1
Net Carrying Amount 15,270 17,058
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]    
Gross  Carrying Amount 2,700 2,890
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 2,700 2,890
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross  Carrying Amount 34,584 34,769
Accumulated Amortization (16,614) (14,822)
Foreign Currency Translation Adjustment 0 1
Net Carrying Amount 17,970 19,948
In Process Research And Development NSCLC    
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]    
Gross  Carrying Amount 1,750  
In Process Research And Development Bulevirtide    
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]    
Gross  Carrying Amount 950  
Intangible asset – sofosbuvir    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 10,720 10,720
Accumulated Amortization (8,273) (7,749)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 2,447 2,971
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization (8,273) (7,749)
Intangible asset – axicabtagene ciloleucel    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 7,110 7,110
Accumulated Amortization (3,026) (2,721)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 4,084 4,389
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization (3,026) (2,721)
Intangible asset – Trodelvy    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 11,730 11,730
Accumulated Amortization (3,894) (3,083)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 7,836 8,647
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization (3,894) (3,083)
Intangible asset – Hepcludex    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 845 845
Accumulated Amortization (394) (329)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 451 516
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization (394) (329)
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 1,479 1,474
Accumulated Amortization (1,028) (940)
Foreign Currency Translation Adjustment 0 1
Net Carrying Amount 451 535
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization $ (1,028) $ (940)