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Collaborations (Details) - Collaborative arrangement with BeiGene, Ltd. [Member] - USD ($)
3 Months Ended 9 Months Ended
Jan. 02, 2020
Sep. 30, 2020
Sep. 30, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Global research and development costs (up to) $ 1,250,000,000    
Other current assets [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Receivable for direct costs owed   $ 112,000,000 $ 112,000,000
Research and Development Expense [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Net costs recovered   $ 57,000,000 $ 169,000,000