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Segment Information (Reportable Segments) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total $ 6,226 $ 4,277  
Allowance for Funds Used During Construction, Investing Activities 16 35  
Regulated Fuel Adjustment 59 61  
Depreciation, Depletion and Amortization 856 588  
Interest Expense 705 598  
Internally Allocated Interest 0 0  
Income (Loss) from Equity Method Investments 124 100  
Income tax expense (recovery) 520 (22)  
Net Income (Loss) Attributable to Parent 266 227  
Segment Reporting Information, Additional Information [Abstract]      
Capital expenditures 1,522 1,069  
Assets, Total 28,771 29,221  
Goodwill 5,805 6,213 $ 264
Investments subject to significant influence 1,215 947  
All External Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 6,226 4,276  
Internal Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 0 1  
Intersegment Eliminations [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total (58) (36)  
Allowance for Funds Used During Construction, Investing Activities 0 0  
Regulated Fuel Adjustment 0 0  
Depreciation, Depletion and Amortization 0 0  
Interest Expense 0 0  
Internally Allocated Interest 0 0  
Income (Loss) from Equity Method Investments 0 0  
Income tax expense (recovery) 0 0  
Net Income (Loss) Attributable to Parent 0 0  
Segment Reporting Information, Additional Information [Abstract]      
Capital expenditures 0 0  
Assets, Total (86) (113)  
Goodwill 0    
Investments subject to significant influence 0    
Intersegment Eliminations [Member] | All External Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 0 0  
Intersegment Eliminations [Member] | Internal Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total (58) (36)  
Emera Florida And New Mexico Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 3,623 1,839  
Allowance for Funds Used During Construction, Investing Activities 5 28  
Regulated Fuel Adjustment 0 0  
Depreciation, Depletion and Amortization 500 243  
Interest Expense 248 125  
Internally Allocated Interest 0 0  
Income (Loss) from Equity Method Investments 0 0  
Income tax expense (recovery) 529 100  
Net Income (Loss) Attributable to Parent 99 172  
Segment Reporting Information, Additional Information [Abstract]      
Capital expenditures 910 547  
Assets, Total 17,216 18,016  
Goodwill 5,566 5,957  
Investments subject to significant influence 0 0  
Emera Florida And New Mexico Segment [Member] | All External Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 3,623 1,839  
Emera Florida And New Mexico Segment [Member] | Internal Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 0 0  
Nova Scotia Power Inc Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 1,338 1,356  
Allowance for Funds Used During Construction, Investing Activities 8 6  
Regulated Fuel Adjustment 59 61  
Depreciation, Depletion and Amortization 207 197  
Interest Expense 134 127  
Internally Allocated Interest 0 0  
Income (Loss) from Equity Method Investments 0 0  
Income tax expense (recovery) 0 12  
Net Income (Loss) Attributable to Parent 129 130  
Segment Reporting Information, Additional Information [Abstract]      
Capital expenditures 385 304  
Assets, Total 4,979 4,776  
Goodwill 0 0  
Investments subject to significant influence 0 0  
Nova Scotia Power Inc Segment [Member] | All External Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 1,335 1,354  
Nova Scotia Power Inc Segment [Member] | Internal Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 3 2  
Emera Maine Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 297 297  
Allowance for Funds Used During Construction, Investing Activities 3 1  
Regulated Fuel Adjustment 0 0  
Depreciation, Depletion and Amortization 47 51  
Interest Expense 20 19  
Internally Allocated Interest 0 0  
Income (Loss) from Equity Method Investments 1 0  
Income tax expense (recovery) 27 23  
Net Income (Loss) Attributable to Parent 46 47  
Segment Reporting Information, Additional Information [Abstract]      
Capital expenditures 82 85  
Assets, Total 1,505 1,543  
Goodwill 143 154  
Investments subject to significant influence 13 13  
Emera Maine Segment [Member] | All External Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 297 297  
Emera Maine Segment [Member] | Internal Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 0 0  
Emera Caribbean Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 434 419  
Allowance for Funds Used During Construction, Investing Activities 0 0  
Regulated Fuel Adjustment 0 0  
Depreciation, Depletion and Amortization 51 48  
Interest Expense 25 15  
Internally Allocated Interest 0 0  
Income (Loss) from Equity Method Investments 3 3  
Income tax expense (recovery) 0 14  
Net Income (Loss) Attributable to Parent 31 100  
Segment Reporting Information, Additional Information [Abstract]      
Capital expenditures 72 87  
Assets, Total 1,251 1,331  
Goodwill 96 102  
Investments subject to significant influence 39 39  
Emera Caribbean Segment [Member] | All External Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 434 419  
Emera Caribbean Segment [Member] | Internal Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 0 0  
Emera Energy Segment [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 465 309  
Allowance for Funds Used During Construction, Investing Activities 0 0  
Regulated Fuel Adjustment 0 0  
Depreciation, Depletion and Amortization 48 45  
Interest Expense 2 1  
Internally Allocated Interest (24) (24)  
Income (Loss) from Equity Method Investments 24 11  
Income tax expense (recovery) 18 (53)  
Net Income (Loss) Attributable to Parent 93 (110)  
Segment Reporting Information, Additional Information [Abstract]      
Capital expenditures 47 39  
Assets, Total 1,575 1,702  
Goodwill 0 0  
Investments subject to significant influence 0 0  
Emera Energy Segment [Member] | All External Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 451 298  
Emera Energy Segment [Member] | Internal Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 14 11  
Corporate and Other [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 127 93  
Allowance for Funds Used During Construction, Investing Activities 0 0  
Regulated Fuel Adjustment 0 0  
Depreciation, Depletion and Amortization 3 4  
Interest Expense 276 311  
Internally Allocated Interest 24 24  
Income (Loss) from Equity Method Investments 96 86  
Income tax expense (recovery) (54) (118)  
Net Income (Loss) Attributable to Parent (132) (112)  
Segment Reporting Information, Additional Information [Abstract]      
Capital expenditures 26 7  
Assets, Total 2,331 1,966  
Goodwill 0 0  
Investments subject to significant influence 1,163 895  
Amortization Related to Unregulated Long Term Debt 24 13  
Corporate and Other [Member] | All External Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total 86 69  
Corporate and Other [Member] | Internal Customers [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Revenues, Total $ 41 $ 24