Segment, Geographic and Other Revenue Information - Revenues by Products - Footnotes (Details) - Paxlovid [Member] treatment_course in Millions, $ in Millions	2 Months Ended	3 Months Ended
	Feb. 29, 2024 treatment_course	Mar. 30, 2025 USD ($)	Sep. 29, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) treatment_course
Revenue from External Customer [Line Items]
Favorable adjustment for government emergency use authorization inventory returned to the company during the period | $		$ 771	$ 771	$ 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