v3.26.1
Cover - shares
3 Months Ended
Mar. 31, 2026
Apr. 24, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 1-42542  
Registrant Name Amrize Ltd  
Entity Incorporation, State or Country Code V8  
Entity Tax Identification Number 98-1807904  
Entity Address, Address Line One Grafenauweg 8  
Entity Address, City or Town Zug  
Entity Address, Country CH  
Entity Address, Postal Zip Code 6300  
Country Region 41  
City Area Code 41  
Local Phone Number 562 3490  
Title of 12(b) Security Ordinary Shares, par value $0.01 per share  
Trading Symbol AMRZ  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   553,536,609
Central Index Key 0002035989  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1