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Net Product Sales - Product Sales Provision Recorded as Accrued Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Change in Contract with Customer, Liability Refund [Roll Forward]        
Balance at December 31, 2023     $ (556)  
Balance at June 30, 2024 $ (554)   (554)  
Net product sales        
Change in Contract with Customer, Liability Refund [Roll Forward]        
Balance at December 31, 2023     (556)  
Provision related to sales made in 2024 (7) $ 0 (62) $ 0
Payments and returns related to sales made in current period     13  
Payments and returns related to sales made in prior year     51  
Balance at June 30, 2024 $ (554)   $ (554)