v3.22.2.2
Cover Page - shares
 9 Months Ended
Oct. 02, 2022
Nov. 04, 2022
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Oct. 02, 2022  
Document Transition Report false  
Entity File Number 1-3619  
Entity Registrant Name PFIZER INC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 13-5315170  
Entity Address, Address Line One 235 East 42nd Street  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10017  
City Area Code 212  
Local Phone Number 733-2323  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   5,613,314,537
Entity Central Index Key 0000078003  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Common Stock, $.05 par value [Member]    
Entity Information [Line Items]    
Title of 12(b) Security Common Stock, $.05 par value  
Trading Symbol PFE  
Security Exchange Name NYSE  
1.000% Notes due 2027 [Member]    
Entity Information [Line Items]    
Title of 12(b) Security 1.000% Notes due 2027  
Trading Symbol PFE27  
Security Exchange Name NYSE