v3.26.1
INTANGIBLE ASSETS - Summary of Intangible Assets, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount $ 31,863 $ 31,888
Accumulated Amortization (17,782) (17,211)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 14,082 14,678
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]    
Gross  Carrying Amount 2,300 2,300
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 2,300 2,300
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross  Carrying Amount 34,163 34,188
Accumulated Amortization (17,782) (17,211)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 16,382 16,978
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 550  
Intangible asset – sofosbuvir    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 10,720 10,720
Accumulated Amortization (8,623) (8,448)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 2,097 2,272
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization (8,623) (8,448)
Intangible asset – axicabtagene ciloleucel    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 7,110 7,110
Accumulated Amortization (3,229) (3,127)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 3,881 3,983
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization (3,229) (3,127)
Intangible asset – Trodelvy    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 11,730 11,730
Accumulated Amortization (4,434) (4,164)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 7,296 7,566
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization (4,434) (4,164)
Intangible asset – Hepcludex    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 845 845
Accumulated Amortization (437) (415)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 408 430
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization (437) (415)
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross  Carrying Amount 1,458 1,483
Accumulated Amortization (1,059) (1,056)
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 400 428
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization $ (1,059) $ (1,056)