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Document and Entity Information
 12 Months Ended
Dec. 31, 2016
shares
Document and Entity Information [Abstract]  
Document Type 40-F
Amendment Flag false
Document Period End Date Dec. 31, 2016
Document Fiscal Year Focus 2016
Document Fiscal Period Focus FY
Current Fiscal Year End Date --12-31
Entity Registrant Name EMERA INC
Entity Central Index Key 0001127248
Entity Current Reporting Status Yes
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Filer Category Accelerated Filer
Trading Symbol EMA
Common Stock  
Entity Common Stock, Shares Outstanding 210,024,389
Series A Preferred Stock [Member]  
Entity Common Stock, Shares Outstanding 3,864,636
Series B Preferred Stock [Member]  
Entity Common Stock, Shares Outstanding 2,135,364
Series C Preferred Stock [Member]  
Entity Common Stock, Shares Outstanding 10,000,000
Series E Preferred Stock [Member]  
Entity Common Stock, Shares Outstanding 5,000,000
Series F Preferred Stock [Member]  
Entity Common Stock, Shares Outstanding 8,000,000