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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 | 6 Months Ended |
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Jun. 28, 2020 | Jun. 28, 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 |  |

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