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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 04, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  |  |  | $ 25,715 |  | $ 22,897
Accumulated Amortization |  |  |  | (7,936) |  | (6,660)
Foreign Currency Translation Adjustment |  |  |  | 1 |  | (1)
Net Carrying Amount |  |  |  | 17,780 |  | 16,236
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 41,835 |  | 39,787
Accumulated Amortization |  |  |  | (7,936) |  | (6,660)
Foreign Currency Translation Adjustment |  |  |  | 1 |  | (1)
Net Carrying Amount |  |  |  | 33,900 |  | 33,126
Acquired IPR&D |  |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 16,120 |  | 16,890
Foreign Currency Translation Adjustment |  |  |  | 0 |  | 0
Net Carrying Amount |  |  |  | 16,120 |  | 16,890
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Reclassified amounts | $ (1,000) | $ (910) |  |  |  |
Acquired IPR&D | Forecast | Subsequent Event |  |  |  |  |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Reclassified amounts |  |  | $ (200) |  |  |
Acquired IPR&D | MYR GmbH |  |  |  |  |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Acquired IPR&D |  | 1,200 |  |  | $ 1,190 |
Intangible asset - sofosbuvir |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 10,720 |  | 10,720
Accumulated Amortization |  |  |  | (5,477) |  | (4,952)
Foreign Currency Translation Adjustment |  |  |  | 0 |  | 0
Net Carrying Amount |  |  |  | 5,243 |  | 5,768
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Accumulated Amortization |  |  |  | (5,477) |  | (4,952)
Intangible asset - axicabtagene ciloleucel |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 7,110 |  | 6,200
Accumulated Amortization |  |  |  | (1,400) |  | (1,105)
Foreign Currency Translation Adjustment |  |  |  | 0 |  | 0
Net Carrying Amount |  |  |  | 5,710 |  | 5,095
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Accumulated Amortization |  |  |  | (1,400) |  | (1,105)
Reclassified amounts |  | $ 910 |  |  |  |
Intangible asset - Trodelvy |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 5,630 |  | 4,600
Accumulated Amortization |  |  |  | (390) |  | (63)
Foreign Currency Translation Adjustment |  |  |  | 0 |  | 0
Net Carrying Amount |  |  |  | 5,240 |  | 4,537
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Accumulated Amortization |  |  |  | (390) |  | (63)
Reclassified amounts | $ 1,000 |  |  |  |  |
Intangible asset - Hepcludex |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 845 |  | 0
Accumulated Amortization |  |  |  | (50) |  | 0
Foreign Currency Translation Adjustment |  |  |  | 0 |  | 0
Net Carrying Amount |  |  |  | 795 |  | 0
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Accumulated Amortization |  |  |  | (50) |  | 0
Other |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Carrying Amount |  |  |  | 1,410 |  | 1,377
Accumulated Amortization |  |  |  | (619) |  | (540)
Foreign Currency Translation Adjustment |  |  |  | 1 |  | (1)
Net Carrying Amount |  |  |  | 792 |  | 836
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Accumulated Amortization |  |  |  | $ (619) |  | $ (540)
Tecartus | Forecast | Subsequent Event |  |  |  |  |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |  |
Reclassified amounts |  |  | $ 200 |  |  |

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