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Cover Page
 12 Months Ended
Dec. 31, 2022
shares
Cover [Abstract]  
Entity Central Index Key 0001127248
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Amendment Flag false
Document Period End Date Dec. 31, 2022
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2022
Current Fiscal Year End Date --12-31
Entity File Number 000-54516
Entity Registrant Name EMERA INC
Entity Incorporation, State or Country Code A5
Entity Listings [Line Items]  
Entity Address, Address Line One 5151 Terminal Road
Entity Address, City or Town Halifax
Entity Address, State or Province NS
Entity Address, Country CA
Entity Address, Postal Zip Code B3J 1A1
City Area Code 902
Local Phone Number 428-6096
Annual Information Form true
Audited Annual Financial Statements true
Entity Current Reporting Status No
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor false
Auditor Name Ernst & Young LLP
Auditor Location Halifax, Nova Scotia, Canada
Auditor Firm Id 1263
Business Contact [Member]  
Entity Listings [Line Items]  
Contact Personnel Name Emera US Finance LP
Entity Address, Address Line One c/o Corporation Service Company
Entity Address Address Line Two 251 Little Falls Drive
Entity Address, City or Town Wilmington
Entity Address, State or Province DE
Entity Address, Postal Zip Code 19808
City Area Code 302
Local Phone Number 636-5401
Common Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 269,944,308
Series A Preferred Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 4,866,814
Series B Preferred Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 1,133,186
Series C Preferred Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 10,000,000
Series E Preferred Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 5,000,000
Series F Preferred Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 8,000,000
Series H Preferred Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 12,000,000
Series J Preferred Stock [Member]  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 8,000,000
Series L Preferred Stock [Member]  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 9,000,000