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Collaborations - UCB (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
UCB | Cost of Sales |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Profit and loss share of expenses | $ 547 | $ 396 | $ 255

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