v3.25.4
Cover - shares
9 Months Ended
Dec. 31, 2025
Feb. 10, 2026
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Dec. 31, 2025  
Document Transition Report false  
Entity File Number 001-32312  
Entity Registrant Name Novelis Inc.  
Entity Incorporation, State or Country Code Z4  
Entity Tax Identification Number 98-0442987  
Entity Address, Address Line One 3550 Peachtree Road NE, Suite 1100  
Entity Address, City or Town Atlanta  
Entity Address, State or Province GA  
Entity Address, Postal Zip Code 30326  
City Area Code 404  
Local Phone Number 760-4000  
Entity Current Reporting Status No  
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   605,000,000
Entity Central Index Key 0001304280  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --03-31