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Cover
 12 Months Ended
Dec. 31, 2019
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, 2019
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2019
Current Fiscal Year End Date --12-31
Entity File Number 000-54516
Entity Registrant Name EMERA INCORPORATED
Entity Incorporation, State or Country Code A5
Entity Address, Address Line One 5151 Terminal Road
Entity Address, City or Town Halifax
Entity Address, State or Province DE
Entity Address, Country CA
Entity Address, Postal Zip Code 428-6096
City Area Code 902
Local Phone Number 428-6096
Entity Listings [Line Items]  
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
Trading Symbol EMA
Annual Information Form true
Audited Annual Financial Statements true
Common Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 242,478,188
Series A Preferred Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 3,864,636
Series B Preferred Stock  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 2,135,364
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