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Cover page
 12 Months Ended
Dec. 31, 2024
shares
Document Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2024
Entity File Number 001-37915
Entity Registrant Name FORTIS INC.
Entity Incorporation, State or Country Code A4
Entity Primary SIC Number 4911
Entity Tax Identification Number 98-0352146
Entity Address, Address Line Three Fortis Place
Entity Address, Address Line Two Suite 1100
Entity Address, Address Line One 5 Springdale Street
Entity Address, City or Town St. John's
Entity Address, State or Province NL
Entity Address, Country CA
Entity Address, Postal Zip Code A1E 0E4
City Area Code 709
Local Phone Number 737-2800
Title of 12(b) Security Common Shares, without par value
Trading Symbol FTS
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 499,304,223
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction Flag false
Entity Central Index Key 0001666175
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Amendment Flag false
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line Two CT Corporation System
Entity Address, Address Line One 28 Liberty Street
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10015
City Area Code 212
Local Phone Number 894-8940
Entity Contact Personnel Name James R. Reid