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GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Intangible Assets [Line Items] |  |  |  |  |
Decrease in goodwill |  | $ 0 | $ 18 |  |
Accumulated goodwill impairment losses |  | 0 |  |  |
Aggregate amortization expense related to finite-lived intangible assets |  | $ 2,300 | $ 1,800 | $ 1,700 |
Discount rate of acquired IPR&D |  | 7.50% | 7.50% | 6.50% |
In-process research and development impairments |  | $ 50 | $ 2,700 | $ 0 |
In Process Research And Development Trodelvy For HR+/HER2- |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived intangible assets, fair value | $ 6,100 | $ 6,100 |  |  |
In Process Research And Development Trodelvy For HR+/HER2- | Fair Value, Nonrecurring |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
In-process research and development impairments | 2,700 |  | 2,700 |  |
MYR |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Decrease in goodwill | $ 18 |  | $ 18 |  |
Immunomedics, Inc. | In Process Research And Development Trodelvy For HR+/HER2- |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Aggregate fair value of acquired IPR&D |  |  |  |  | $ 8,800
Immunomedics, Inc. | In Process Research And Development Trodelvy For HR+/HER2- | Measurement Input, Discount Rate |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Discount rate, measurement input | 6.75% |  |  |  |

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