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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 25,919 | $ 25,915
Accumulated Amortization | (9,700) | (8,381)
Foreign Currency Translation Adjustment | 1 | 1
Net Carrying Amount | 16,220 | 17,535
Intangible Assets, Net (Including Goodwill) [Abstract] |  |
Gross Carrying Amount | 39,139 | 41,835
Accumulated Amortization | (9,700) | (8,381)
Foreign Currency Translation Adjustment | 1 | 1
Net Carrying Amount | 29,440 | 33,455
Indefinite-lived assets – IPR&D |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Gross Carrying Amount | 13,220 | 15,920
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 13,220 | 15,920
Intangible asset – sofosbuvir |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,720 | 10,720
Accumulated Amortization | (6,176) | (5,651)
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 4,544 | 5,069
Intangible Assets, Net (Including Goodwill) [Abstract] |  |
Accumulated Amortization | (6,176) | (5,651)
Intangible asset – axicabtagene ciloleucel |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,110 | 7,110
Accumulated Amortization | (1,806) | (1,501)
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 5,304 | 5,609
Intangible Assets, Net (Including Goodwill) [Abstract] |  |
Accumulated Amortization | (1,806) | (1,501)
Intangible asset – Trodelvy |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,630 | 5,630
Accumulated Amortization | (856) | (507)
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 4,774 | 5,123
Intangible Assets, Net (Including Goodwill) [Abstract] |  |
Accumulated Amortization | (856) | (507)
Intangible asset – Hepcludex |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 845 | 845
Accumulated Amortization | (136) | (72)
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 709 | 773
Intangible Assets, Net (Including Goodwill) [Abstract] |  |
Accumulated Amortization | (136) | (72)
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,614 | 1,610
Accumulated Amortization | (726) | (650)
Foreign Currency Translation Adjustment | 1 | 1
Net Carrying Amount | 889 | 961
Intangible Assets, Net (Including Goodwill) [Abstract] |  |
Accumulated Amortization | $ (726) | $ (650)

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