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Net Product Sales - Net Product Sales by Customer Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 241	$ 344	$ 408	$ 2,206
Net product sales
Disaggregation of Revenue [Line Items]
Total revenue	184	293	351	2,121
United States | Net product sales
Disaggregation of Revenue [Line Items]
Total revenue	162	2	262	3
Europe | Net product sales
Disaggregation of Revenue [Line Items]
Total revenue	0	60	0	636
Rest of world | Net product sales
Disaggregation of Revenue [Line Items]
Total revenue	$ 22	$ 231	$ 89	$ 1,482

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