| Document and Entity Information Document | Oct. 30, 2024 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 30, 2024 |
| Entity Registrant Name | ITC HOLDINGS CORP. |
| Entity Central Index Key | 0001317630 |
| Amendment Flag | false |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-32576 |
| Entity Incorporation, State or Country Code | MI |
| Entity Tax Identification Number | 32-0058047 |
| Entity Address, Address Line One | 27175 Energy Way |
| Entity Address, City or Town | Novi |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48377 |
| City Area Code | 248 |
| Local Phone Number | 946-3000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
