v3.26.1
Cover Page
6 Months Ended
Jun. 30, 2026
Cover [Abstract]  
Document Type 6-K
Entity File Number 001-37915
Entity Registrant Name Fortis Inc.
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
Entity Central Index Key 0001666175
Current Fiscal Year End Date --12-31
Document Period End Date Jun. 30, 2026
Document Fiscal Year Focus 2026
Document Fiscal Period Focus Q2
Amendment Flag false