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Document and Entity Information
Nov. 18, 2025
Document And Entity Information [Line Items]  
Entity Registrant Name PFIZER INC
Amendment Flag false
Entity Central Index Key 0000078003
Document Type 8-K
Document Period End Date Nov. 18, 2025
Entity Incorporation State Country Code DE
Entity File Number 1-3619
Entity Tax Identification Number 13-5315170
Entity Address, Address Line One 66 Hudson Boulevard East
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10001-2192
City Area Code (212)
Local Phone Number 733-2323
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, $0.05 par value
Trading Symbol PFE
Security Exchange Name NYSE
M 1.000 Notes Due 20275 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.000% Notes due 2027
Trading Symbol PFE/27
Security Exchange Name NYSE
M 2.875 Notes Due 20291 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.875% Notes due 2029
Trading Symbol PFE/29
Security Exchange Name NYSE
M 3.250 Notes Due 20322 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 3.250% Notes due 2032
Trading Symbol PFE/32
Security Exchange Name NYSE
M 3.875 Notes Due 20373 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 3.875% Notes due 2037
Trading Symbol PFE/37A
Security Exchange Name NYSE
M 4.250 Notes Due 20454 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 4.250% Notes due 2045
Trading Symbol PFE/45
Security Exchange Name NYSE