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INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 31,894 |  | $ 25,794
Accumulated Amortization | (11,863) |  | (10,121)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 20,032 |  | 15,674
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount | 39,014 |  | 39,014
Accumulated Amortization | (11,863) |  | (10,121)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 27,152 |  | 28,894
IPR&D |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |
Gross Carrying Amount | 7,120 |  | 13,220
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 7,120 |  | 13,220
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Reclassified intangible assets |  | $ 6,100 |
Intangible asset – sofosbuvir |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 10,720 |  | 10,720
Accumulated Amortization | (6,875) |  | (6,350)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 3,845 |  | 4,370
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (6,875) |  | (6,350)
Intangible asset – axicabtagene ciloleucel |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 7,110 |  | 7,110
Accumulated Amortization | (2,213) |  | (1,908)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 4,897 |  | 5,202
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (2,213) |  | (1,908)
Intangible asset – Trodelvy |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 11,730 |  | 5,630
Accumulated Amortization | (1,732) |  | (973)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 9,998 |  | 4,657
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (1,732) |  | (973)
Reclassified intangible assets |  | $ 6,100 |
Intangible asset – Hepcludex |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 845 |  | 845
Accumulated Amortization | (222) |  | (158)
Foreign Currency Translation Adjustment | 0 |  | 0
Net Carrying Amount | 623 |  | 687
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | (222) |  | (158)
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,489 |  | 1,489
Accumulated Amortization | (822) |  | (733)
Foreign Currency Translation Adjustment | 1 |  | 1
Net Carrying Amount | 668 |  | 758
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Accumulated Amortization | $ (822) |  | $ (733)

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