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Net Product Sales - Product Sales Provision Recorded as Accrued Liabilities (Details)
$ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
Change in Contract with Customer, Liability Refund [Roll Forward]  
Balance at December 31, 2024 $ (370)
Balance at December 31, 2025 (509)
Net product sales  
Change in Contract with Customer, Liability Refund [Roll Forward]  
Balance at December 31, 2024 (370)
Provision related to sales made in current period (436)
Provision related to sales made in prior periods (13)
Payments and returns related to sales made in current period 28
Payments and returns related to sales made in prior periods 282
Balance at December 31, 2025 $ (509)