v3.26.1
Fair Value Measurements (Details) - Pfizer Savings Plan - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value $ 22,510,611 $ 20,301,844
Pfizer Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 938,916 1,058,778
Common/collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 18,660,013 16,252,996
Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 566,228 838,470
Self-directed brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 487,501 408,798
Common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 1,761,828 1,686,294
Common/collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 38,734 24,669
Other    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 57,391 31,839
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 3,811,864 4,024,179
Level 1 | Pfizer Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 938,916 1,058,778
Level 1 | Common/collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 566,228 838,470
Level 1 | Self-directed brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 487,501 408,798
Level 1 | Common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 1,761,828 1,686,294
Level 1 | Common/collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 1 | Other    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 57,391 31,839
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 18,698,747 16,277,664
Level 2 | Pfizer Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2 | Common/collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 18,660,013 16,252,996
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2 | Self-directed brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2 | Common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 0 0
Level 2 | Common/collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value 38,734 24,669
Level 2 | Other    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments, at fair value $ 0 $ 0