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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)

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