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DIVENSTITURES, LICENSING AND OTHER ARRANGEMENTS - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 36 Months Ended | 84 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2026 | Dec. 31, 2023 | Dec. 31, 2022
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Payment to extinguish future royalty obligation |  |  | $ 295 |  |  |  |
Nimbus Therapuetics TYK2 Inhibitor |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Proceeds from legal settlements |  | $ 400 |  | $ 40 |  |  |
Contingent sales-based milestones | $ 2,000 |  |  |  |  |  |
Other (income)/expense |  | $ 400 |  |  |  |  |
Keytruda Royalties | Forecast |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Percentage of net sales payable to alliance partner |  |  |  |  |  | 6.50% |
Keytruda Royalties | Forecast | Subsequent Event |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Percentage of net sales payable to alliance partner |  |  |  |  | 2.50% |  |
Immatics |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Upfront payments |  |  |  | 150 |  |  |
Contingent and regulatory milestone payments |  |  |  | 770 |  |  |
Dragonfly |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Upfront payments |  |  |  | $ 175 |  |  |
Nimbus Therapeutics |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Upfront payments | $ 4,000 |  |  |  |  |  |
Nimbus Therapeutics | Nimbus Therapuetics TYK2 Inhibitor |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Change in control proceeds |  |  |  | 10.00% |  |  |
Percentage of ownership acquired | 100.00% |  |  |  |  |  |
Bristol-Myers Squibb | Keytruda Royalties | Forecast | Subsequent Event |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Payment and royalty allocation |  |  |  |  | 75.00% |  |
Ono | Keytruda Royalties | Forecast | Subsequent Event |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Payment and royalty allocation |  |  |  |  | 25.00% |  |
Mature products and other | Discontinued Operations, Held-for-sale |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |  | $ 172
Liabilities held for sale |  |  |  |  |  |  | 20
Mature products and other | Cost of products sold |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Asset impairment charges |  |  | $ 63 |  |  |  |
Mature products and other | LOTTE Corporation |  |  |  |  |  |  |
Licensing Arrangements [Line Items] |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  | $ 159

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