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Collaborative Arrangements - AstraZeneca PLC - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Jan. 31, 2028
Jan. 31, 2027
Jan. 31, 2026
Koselugo | Licenses and Other              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Finite-lived intangible assets   $ 41,000,000 $ 41,000,000        
Lynparza | Licenses and Other              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Finite-lived intangible assets   926,000,000 926,000,000        
AstraZeneca | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Upfront payments recognized as revenue     150,000,000        
Sales based milestone payments     700,000,000        
AstraZeneca | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Alliance revenue - Koselugo              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Upfront payments recognized as revenue   150,000,000          
Aggregate, regulatory milestones payments, maximum   75,000,000 75,000,000        
Sales milestone payments   235,000,000 235,000,000        
AstraZeneca | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Alliance revenue - Koselugo | Forecast              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Future fixed upfront payments received         $ 100,000,000 $ 150,000,000 $ 150,000,000
AstraZeneca | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Koselugo              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Upfront payments recognized as revenue   50,000,000 50,000,000        
Sales based milestone payments     100,000,000        
AstraZeneca | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Koselugo | Forecast              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Upfront payments recognized as revenue $ 50,000,000            
AstraZeneca | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Lynparza              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Aggregate, regulatory milestones payments, maximum   0 0        
Sales milestone payments   $ 2,000,000,000.0 2,000,000,000.0        
Sales based milestone payments     $ 600,000,000        
Regulatory milestone payments       $ 245,000,000