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Acquisition, Equity-Method Investment and Licensing Arrangements - Valneva SE (Details) - Licensing Agreements [Member] - Valneva SE [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 28, 2020
Sep. 27, 2020
Apr. 30, 2020
Business Acquisition [Line Items]      
Maximum potential cash payments     $ 308
Potential development milestones     35
Potential early commercialization milestones     $ 143
Valneva's development cost ownership percentage   30.00%  
Research and Development Expense [Member]      
Business Acquisition [Line Items]      
Upfront payment for licensing arrangement $ 130