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INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 31,819 | $ 31,819
Accumulated Amortization | (13,032) | (12,436)
Foreign Currency Translation Adjustment | 1 | 1
Net Carrying Amount | 18,788 | 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 | (13,032) | (12,436)
Foreign Currency Translation Adjustment | 1 | 1
Net Carrying Amount | 23,428 | 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 Bulveritide |  |
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 | (7,224) | (7,050)
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 3,496 | 3,670
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Accumulated Amortization | (7,224) | (7,050)
Intangible asset – axicabtagene ciloleucel |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,110 | 7,110
Accumulated Amortization | (2,416) | (2,314)
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 4,694 | 4,796
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Accumulated Amortization | (2,416) | (2,314)
Intangible asset – Trodelvy |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 11,730 | 11,730
Accumulated Amortization | (2,272) | (2,002)
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 9,458 | 9,728
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Accumulated Amortization | (2,272) | (2,002)
Intangible asset – Hepcludex |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 845 | 845
Accumulated Amortization | (265) | (243)
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 580 | 602
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Accumulated Amortization | (265) | (243)
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,414 | 1,414
Accumulated Amortization | (855) | (827)
Foreign Currency Translation Adjustment | 1 | 1
Net Carrying Amount | 560 | 588
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Accumulated Amortization | $ (855) | $ (827)

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