Cover - shares	3 Months Ended
	Jun. 30, 2024	Aug. 06, 2024
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
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		600,000,000
Entity Central Index Key	0001304280
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--03-31