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Segment, Geographic and Other Revenue Information - Revenues by Products - Footnotes (Details) treatment_course in Millions, $ in Millions	2 Months Ended	3 Months Ended	9 Months Ended
	Feb. 29, 2024 treatment_course	Sep. 29, 2024 USD ($) treatment_course	Sep. 29, 2024 USD ($) treatment_course	Dec. 31, 2023 USD ($) treatment_course
Paxlovid [Member]
Revenue from External Customer [Line Items]
Favorable adjustment for government emergency use authorization inventory returned to the company during the period | $			$ 771
Reversal of revenue | $				$ 3,500
Government emergency use authorization inventory returned to the company during the period, number of treatment courses | treatment_course	5.1
Estimated government emergency use authorization inventory to be returned to company, number of treatment courses | treatment_course				6.5
Paxlovid, NDA-Labeled, U.S. Strategic National Stockpile [Member]
Revenue from External Customer [Line Items]
Revenues | $		$ 442	$ 442
Supply commitment, minimum amount committed, number of treatment courses | treatment_course		1.0	1.0

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