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Document and Entity Information
 12 Months Ended
Dec. 31, 2016
Document and Entity Information [Abstract]  
Document Type 6-K
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