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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
In-process research and development impairment | $ 0 |  | $ 0 | $ 2,700 | $ 0 |
Fair Value, Nonrecurring | In Process Research And Development Trodelvy For HR+/HER2- |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
In-process research and development impairment |  | $ 2,700 |  | 2,700 |  |
Market value | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Short-term and long-term debt | 21,200 |  |  | 21,200 |  | $ 28,600
Market value | Level 3 | Immunomedics | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Future royalties | 1,100 |  |  | 1,100 |  | 1,300
Carrying value | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Short-term and long-term debt, carrying values | 24,100 |  |  | 24,100 |  | 25,600
Carrying value | Level 3 | Immunomedics | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Future royalties | $ 1,100 |  |  | $ 1,100 |  | $ 1,100

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