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Available for Sale Debt Securities (Details) - Cytokinetics
$ in Millions
 1 Months Ended 3 Months Ended
May 31, 2024
USD ($)
tranche
quarter
payment
Mar. 31, 2026
USD ($)
Development Funding    
Debt and Equity Securities, FV-NI [Line Items]    
Long term funding partnership, amount | $ $ 100  
Long term funding partnership, royalty installment repayments, amount | $ $ 100  
Long term funding partnership, royalty percentage on annual net sales 2.00%  
Number of quarters | quarter 18  
Installment repayments, percentage of amount drawn 2.4  
Development Funding | Phase 3 Trial    
Debt and Equity Securities, FV-NI [Line Items]    
Number of quarters | quarter 22  
Installment repayments, percentage of amount drawn 2.3  
Commercial Launch Funding    
Debt and Equity Securities, FV-NI [Line Items]    
Long term funding partnership, amount | $ $ 525  
Number of additional funding tranches | tranche 2  
Long term funding partnership, number of tranches | tranche 7  
Commercial Launch Funding | Tranches One, Four, Five And Six    
Debt and Equity Securities, FV-NI [Line Items]    
Long term funding partnership, amount | $   $ 275
Commercial Launch Funding | Tranche Two    
Debt and Equity Securities, FV-NI [Line Items]    
Long term funding partnership, tranches no longer available | tranche 2  
Commercial Launch Funding | Tranche 3    
Debt and Equity Securities, FV-NI [Line Items]    
Long term funding partnership, tranches no longer available | tranche 3  
Commercial Launch Funding | Tranche 7    
Debt and Equity Securities, FV-NI [Line Items]    
Number of tranches available for draw | tranche 7  
Commercial Launch Funding | Tranches One, Four, Five, Six, And Seven    
Debt and Equity Securities, FV-NI [Line Items]    
Installment repayments, percentage of amount drawn 1.9  
Number of consecutive quarterly payments | payment 34  
Commercial Launch Funding | Cytokinetics Funding Commitments | Tranche 7    
Debt and Equity Securities, FV-NI [Line Items]    
Future draw amount | $ $ 175