Acquisition, Equity-Method Investment and Licensing Arrangements - BioNTech (Details) - Licensing Agreements [Member] - BionTech [Member] - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Apr. 09, 2020	Jul. 31, 2020	Jun. 28, 2020
Business Acquisition [Line Items]
Value of shares purchased		$ 50	$ 113
Potential future milestone payments	$ 563
Maximum potential cash payments	$ 748
Research and development arrangement, percentage of costs to be reimbursed	50.00%
Research and Development Expense [Member]
Business Acquisition [Line Items]
Upfront payment for licensing arrangement			$ 72