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INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 31,819 |  | $ 31,819
Accumulated Amortization | (13,628) |  | (12,436)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 18,192 |  | 19,384
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount | 4,640 |  | 7,070
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 4,640 |  | 7,070
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount | 36,459 |  | 38,889
Accumulated Amortization | (13,628) |  | (12,436)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 22,832 |  | 26,454
In Process Research And Development NSCLC |  |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Indefinite-lived intangible assets, fair value |  | $ 3,500 | 5,900
In Process Research And Development Bulevirtide |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount |  |  | 1,100
Intangible asset – sofosbuvir |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 10,720 |  | 10,720
Accumulated Amortization | (7,399) |  | (7,050)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 3,321 |  | 3,670
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (7,399) |  | (7,050)
Intangible asset – axicabtagene ciloleucel |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 7,110 |  | 7,110
Accumulated Amortization | (2,517) |  | (2,314)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 4,593 |  | 4,796
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (2,517) |  | (2,314)
Intangible asset – Trodelvy |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 11,730 |  | 11,730
Accumulated Amortization | (2,543) |  | (2,002)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 9,187 |  | 9,728
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (2,543) |  | (2,002)
Intangible asset – Hepcludex |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 845 |  | 845
Accumulated Amortization | (286) |  | (243)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 559 |  | 602
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (286) |  | (243)
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,414 |  | 1,414
Accumulated Amortization | (883) |  | (827)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 533 |  | 588
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | $ (883) |  | $ (827)

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