Subsequent Event	9 Months Ended
	Sep. 27, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventAgreement to Combine Upjohn with Mylan––On July 29, 2019, we announced an agreement to combine Upjohn with Mylan, creating a new global pharmaceutical company, Viatris. The transaction is structured as an all-stock, Reverse Morris Trust transaction, under which Upjohn will be spun off to our shareholders and, immediately thereafter, combined with Mylan. Pfizer shareholders would own 57% of the combined new company, and former Mylan shareholders would own 43%. The transaction was approved by Mylan’s shareholders in June 2020. In October 2020, Pfizer and Mylan announced that the FTC accepted a proposed consent order, which concluded the FTC’s review of the proposed combination of Mylan and Pfizer’s Upjohn business, and that the parties have now obtained all required antitrust clearances for the proposed transaction. Also, in October 2020, Pfizer announced that it had set the close of business on November 13, 2020 as the record date for the proposed spin-off and that the transaction is expected to close on November 16, 2020, subject to customary closing conditions.