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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 31,819 |  | $ 31,819 | $ 25,794 |
Accumulated Amortization | (12,436) |  | (12,436) | (10,121) |
Foreign Currency Translation Adjustment | 1 |  | 1 | 1 |
Total | 19,384 |  | 19,384 | 15,674 |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |
Gross Carrying Amount | 7,070 |  | 7,070 | 13,220 |
Foreign Currency Translation Adjustment | 0 |  | 0 | 0 |
Net Carrying Amount | 7,070 |  | 7,070 | 13,220 |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
Gross Carrying Amount | 38,889 |  | 38,889 | 39,014 |
Accumulated Amortization | (12,436) |  | (12,436) | (10,121) |
Foreign Currency Translation Adjustment | 1 |  | 1 | 1 |
Net Carrying Amount | 26,454 |  | 26,454 | 28,894 |
Write-off of finite-lived intangible asset |  |  | 2,300 | 1,800 | $ 1,700
In-process research and development impairments |  |  | 50 | 2,700 | $ 0
Fair Value, Nonrecurring | Galapagos |  |  |  |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
Write-off of finite-lived intangible asset | 51 |  |  |  |
In Process Research And Development Trodelvy For HR+/HER2- |  |  |  |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
Indefinite-lived intangible assets, fair value | 6,100 | $ 6,100 | 6,100 |  |
In Process Research And Development Trodelvy For HR+/HER2- | Fair Value, Nonrecurring |  |  |  |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
In-process research and development impairments |  | $ 2,700 |  | 2,700 |
In Process Research And Development Bulveritide |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |
Gross Carrying Amount | 1,100 |  | 1,100 |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
In-process research and development impairments | 50 |  |  |  |
In Process Research And Development Bulveritide | Fair Value, Nonrecurring |  |  |  |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
In-process research and development impairments | 50 |  |  |  |
In Process Research And Development NSCLC |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |
Gross Carrying Amount | 5,900 |  | 5,900 |  |
Intangible asset – sofosbuvir |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 10,720 |  | 10,720 | 10,720 |
Accumulated Amortization | (7,050) |  | (7,050) | (6,350) |
Foreign Currency Translation Adjustment | 0 |  | 0 | 0 |
Total | 3,670 |  | 3,670 | 4,370 |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
Accumulated Amortization | (7,050) |  | (7,050) | (6,350) |
Intangible asset – axicabtagene ciloleucel |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 7,110 |  | 7,110 | 7,110 |
Accumulated Amortization | (2,314) |  | (2,314) | (1,908) |
Foreign Currency Translation Adjustment | 0 |  | 0 | 0 |
Total | 4,796 |  | 4,796 | 5,202 |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
Accumulated Amortization | (2,314) |  | (2,314) | (1,908) |
Intangible asset – Trodelvy |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 11,730 |  | 11,730 | 5,630 |
Accumulated Amortization | (2,002) |  | (2,002) | (973) |
Foreign Currency Translation Adjustment | 0 |  | 0 | 0 |
Total | 9,728 |  | 9,728 | 4,657 |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
Accumulated Amortization | (2,002) |  | (2,002) | (973) |
Intangible asset – Hepcludex |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 845 |  | 845 | 845 |
Accumulated Amortization | (243) |  | (243) | (158) |
Foreign Currency Translation Adjustment | 0 |  | 0 | 0 |
Total | 602 |  | 602 | 687 |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
Accumulated Amortization | (243) |  | (243) | (158) |
Other |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 1,414 |  | 1,414 | 1,489 |
Accumulated Amortization | (827) |  | (827) | (733) |
Foreign Currency Translation Adjustment | 1 |  | 1 | 1 |
Total | 588 |  | 588 | 758 |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |  |  |
Accumulated Amortization | $ (827) |  | $ (827) | $ (733) |

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