v3.26.1
Revenue - Summary of Disaggregation of Total Revenues from Customers (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation Of Revenue [Line Items]        
Total revenues $ 214 $ 167 $ 350 $ 306
Product Revenue        
Disaggregation Of Revenue [Line Items]        
Total revenues 112 81 201 172
Product Revenue | Crysvita        
Disaggregation Of Revenue [Line Items]        
Total revenues 54 35 100 90
Product Revenue | Dojolvi        
Disaggregation Of Revenue [Line Items]        
Total revenues 27 23 45 40
Product Revenue | Evkeeza        
Disaggregation Of Revenue [Line Items]        
Total revenues 21 14 39 25
Product Revenue | Mepsevii        
Disaggregation Of Revenue [Line Items]        
Total revenues 10 9 17 17
Royalty revenue        
Disaggregation Of Revenue [Line Items]        
Total revenues 102 86 149 134
Royalty revenue | Crysvita        
Disaggregation Of Revenue [Line Items]        
Total revenues $ 102 $ 86 $ 149 $ 134