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INTANGIBLE ASSETS - Summary of Intangible Assets, Net (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 31,879 |  | $ 31,819
Accumulated Amortization | (14,224) |  | (12,436)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 17,656 |  | 19,384
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount | 2,890 |  | 7,070
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 2,890 |  | 7,070
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount | 34,769 |  | 38,889
Accumulated Amortization | (14,224) |  | (12,436)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 20,546 |  | 26,454
In Process Research And Development NSCLC |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount | 1,800 |  | 5,900
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Indefinite-lived intangible assets, fair value | 1,800 | $ 3,500 |
In Process Research And Development Bulevirtide |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount | 1,100 |  | 1,100
Intangible asset – sofosbuvir |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 10,720 |  | 10,720
Accumulated Amortization | (7,574) |  | (7,050)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 3,146 |  | 3,670
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (7,574) |  | (7,050)
Intangible asset – axicabtagene ciloleucel |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 7,110 |  | 7,110
Accumulated Amortization | (2,619) |  | (2,314)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 4,491 |  | 4,796
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (2,619) |  | (2,314)
Intangible asset – Trodelvy |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 11,730 |  | 11,730
Accumulated Amortization | (2,813) |  | (2,002)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 8,917 |  | 9,728
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (2,813) |  | (2,002)
Intangible asset – Hepcludex |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 845 |  | 845
Accumulated Amortization | (308) |  | (243)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 537 |  | 602
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (308) |  | (243)
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,474 |  | 1,414
Accumulated Amortization | (911) |  | (827)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 565 |  | 588
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | $ (911) |  | $ (827)

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