v3.26.1
Fair Value Measurements (Details) - EBP 001 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 911,174,783 $ 762,010,202
Total    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 911,174,783 762,010,202
Total | Amgen stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 126,196,526 100,973,506
Total | Cash and cash equivalents    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 339,411 43,702
Total | Collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 722,136,732 577,297,941
Total | Common and preferred stocks    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 8,175,678 47,870,415
Total | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 27,612,784 16,198,902
Total | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 26,713,652 19,625,736
Quoted prices in active markets for identical assets (Level 1)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 189,038,051 184,712,261
Quoted prices in active markets for identical assets (Level 1) | Amgen stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 126,196,526 100,973,506
Quoted prices in active markets for identical assets (Level 1) | Cash and cash equivalents    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 339,411 43,702
Quoted prices in active markets for identical assets (Level 1) | Collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) | Common and preferred stocks    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 8,175,678 47,870,415
Quoted prices in active markets for identical assets (Level 1) | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 27,612,784 16,198,902
Quoted prices in active markets for identical assets (Level 1) | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 26,713,652 19,625,736
Significant other observable inputs (Level 2)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 722,136,732 577,297,941
Significant other observable inputs (Level 2) | Amgen stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant other observable inputs (Level 2) | Cash and cash equivalents    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant other observable inputs (Level 2) | Collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 722,136,732 577,297,941
Significant other observable inputs (Level 2) | Common and preferred stocks    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant other observable inputs (Level 2) | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant other observable inputs (Level 2) | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant unobservable inputs (Level 3)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant unobservable inputs (Level 3) | Amgen stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant unobservable inputs (Level 3) | Cash and cash equivalents    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant unobservable inputs (Level 3) | Collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant unobservable inputs (Level 3) | Common and preferred stocks    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant unobservable inputs (Level 3) | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant unobservable inputs (Level 3) | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 0 $ 0