| Document and Entity Information | May 06, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | May 06, 2024 |
| Entity Registrant Name | NOVELIS INC. |
| Entity Incorporation, State or Country Code | Z4 |
| Entity File Number | 001-32312 |
| Entity Tax Identification Number | 98-0442987 |
| Entity Address, Address Line One | One Phipps Plaza, 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001304280 |
