v3.25.4
Financial Instruments - Long-Term Debt, New Issuances (Details)
€ in Millions, $ in Millions
 1 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
May 31, 2023
USD ($)
Debt Instrument [Line Items]      
Effective interest rate     4.93%
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 6,000 [1],[2] € 3,300 [1],[3] $ 31,000
Unsecured Debt [Member] | Senior Unsecured Notes, Due November 2027-2065 [Member]      
Debt Instrument [Line Items]      
Effective interest rate 4.583% 4.583%  
Unsecured Debt [Member] | Senior Unsecured Notes, Due November 2027 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 0.50% 0.50%  
Debt instrument, face amount [1] $ 500    
Unsecured Debt [Member] | Senior Unsecured Notes, 3.875%, Due November 2027 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 3.875% 3.875%  
Debt instrument, face amount [1] $ 1,000    
Unsecured Debt [Member] | Senior Unsecured Notes, 4.200%, Due November 2030 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 4.20% 4.20%  
Debt instrument, face amount [1] $ 1,000    
Unsecured Debt [Member] | Senior Unsecured Notes, 4.500%, Due November 2032 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 4.50% 4.50%  
Debt instrument, face amount [1] $ 1,250    
Unsecured Debt [Member] | Senior Unsecured Notes, 2.875%, Due May 2029 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 4.875% 4.875%  
Debt instrument, face amount [1] $ 1,250    
Unsecured Debt [Member] | Senior Unsecured Notes, 5.600%, Due November 2055 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 5.60% 5.60%  
Debt instrument, face amount [1] $ 500    
Unsecured Debt [Member] | Senior Unsecured Notes, 5.700%, Due November 2065 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 5.70% 5.70%  
Debt instrument, face amount [1] $ 500    
Unsecured Debt [Member] | Senior Unsecured Notes, Due May 2029-2045      
Debt Instrument [Line Items]      
Effective interest rate 3.605% 3.605%  
Unsecured Debt [Member] | Senior Unsecured Notes, 2.875%, Due May 2029 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 2.875% 2.875%  
Debt instrument, face amount | € [1]   € 750  
Unsecured Debt [Member] | Senior Unsecured Notes, 3.250%, Due May 2032 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 3.25% 3.25%  
Debt instrument, face amount | € [1]   € 1,000  
Unsecured Debt [Member] | Senior Unsecured Notes, 3.875%, Due May 2037 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 3.875% 3.875%  
Debt instrument, face amount | € [1]   € 750  
Unsecured Debt [Member] | Senior Unsecured Notes, 4.250%, Due May 2045 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 4.25% 4.25%  
Debt instrument, face amount | € [1]   € 800  
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2026 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 4.45% 4.45%  
Redemption of senior unsecured notes $ 3,000    
[1] The fixed rate notes may be redeemed by us at any time, in whole, or in part, at a make-whole redemption price plus accrued and unpaid interest.
[2] The net proceeds from the sale of the notes were used for general corporate purposes, including the acquisition of Metsera and the refinancing of existing indebtedness. The weighted average effective interest rate for the notes at issuance was 4.583%.
[3] Issued through our wholly-owned finance subsidiary, PNIF, for general corporate purposes. The notes are fully and unconditionally guaranteed on a senior unsecured basis by Pfizer Inc. PNIF has no assets or operations and will have no assets or operations, other than as related to the issuance, administration and repayment of the notes and any other debt securities that it may issue in the future. The weighted average effective interest rate for the notes at issuance was 3.605%.