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 $ 8,165,509,482 $ 7,032,543,261
Total    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 8,165,509,482 7,032,543,261
Total | Amgen stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 417,689,989 344,055,715
Total | Cash and cash equivalents    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 5,471,574 3,466,558
Total | Collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 6,275,138,481 5,003,198,779
Total | Common and preferred stocks    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 92,034,453 533,256,711
Total | Debt securities    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 2,685 2,979
Total | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 255,411,543 148,845,846
Total | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,119,760,757 999,716,673
Quoted prices in active markets for identical assets (Level 1)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,887,625,908 2,026,022,128
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 417,689,989 344,055,715
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 5,471,574 3,466,558
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 92,034,453 533,256,711
Quoted prices in active markets for identical assets (Level 1) | Debt securities    
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) | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 255,411,543 148,845,846
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 1,117,018,349 996,397,298
Significant other observable inputs (Level 2)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 6,277,883,574 5,006,521,133
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 6,275,138,481 5,003,198,779
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) | Debt securities    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 2,685 2,979
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 2,742,408 3,319,375
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) | Debt securities    
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