Cover Page	6 Months Ended
	Jun. 30, 2020
Cover [Abstract]
Document Type	6-K
Entity Registrant Name	Fortis Inc.
Entity Central Index Key	0001666175
Current Fiscal Year End Date	--12-31
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false