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Collaborative Arrangements - Eisai Co., Ltd. - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Mar. 31, 2024
Alliance revenue - Lenvima | Other Intangible Assets | Licenses and Other        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Finite-lived intangible assets       $ 623
Eisai        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Amortization of intangible assets $ 81   $ 72  
Eisai | Alliance revenue - Lenvima | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Probable contingent payments 125   $ 125  
Liabilities $ 250     125
Sales-based milestone payments   $ 125    
Eligible future contingent sales-based milestone payments (up to)       $ 2,300