Product, Geographic and Other Revenue Information - Narrative (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) country	Dec. 31, 2019 country	Dec. 31, 2018 country
Government and Government Sponsored [Member] | BNT162b2 [Member]
Segment Reporting Information [Line Items]
Deferred revenue | $	$ 957
Geographic Concentration Risk [Member] | Revenue [Member] | Outside United States [Member]
Segment Reporting Information [Line Items]
Number of countries with revenue exceeding $500 million | country	8	10	10
Geographic Concentration Risk [Member] | Revenue [Member] | US [Member]
Segment Reporting Information [Line Items]
Percentage of total revenues	10.00%	10.00%	10.00%
Geographic Concentration Risk [Member] | Revenue [Member] | China [Member]
Segment Reporting Information [Line Items]
Percentage of total revenues	6.00%	6.00%	6.00%
Geographic Concentration Risk [Member] | Revenue [Member] | Japan [Member]
Segment Reporting Information [Line Items]
Percentage of total revenues	6.00%	5.00%	5.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Largest U.S. Wholesaler Customers [Member]
Segment Reporting Information [Line Items]
Percentage of total revenues	30.00%	25.00%	29.00%