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SUPPLEMENTAL FINANCIAL INFORMATION (Condensed Consolidated Statement of Financial Position) (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets, Current [Abstract]      
Cash, Cash Equivalents, and Short-term Investments $ 438 $ 404 $ 1,092
Restricted Cash and Cash Equivalents, Current 65 87  
Inventory, Net 418 472  
Derivative Instruments and Hedges, Assets 141 145  
Regulatory Assets, Current 138 80  
Other Assets, Current 1,326 1,323  
Total current assets 2,526 2,511  
Property, Plant and Equipment, Net 16,995 17,290  
Other Assets, Noncurrent [Abstract]      
Deferred income taxes 138 125  
Derivative instruments 112 131  
Regulatory assets 1,238 1,242  
Net investment in direct financing lease 481 488  
Investments subject to significant influence 1,215 947  
Goodwill 5,805 6,213 264
Other investments - intercompany 0 0  
Other long term assets 261 274  
Total other assets 9,250 9,420  
Assets, Total 28,771 29,221  
Liabilities, Current [Abstract]      
Short-term debt 1,241 961  
Current portion of long-term debt 741 476  
Accounts payable 1,161 1,242  
Derivative instruments 227 325  
Regulatory liabilities 226 362  
Other current liabilities 350 358  
Total current liabilities 3,946 3,724  
Liabilities, Noncurrent [Abstract]      
Long-term debt 13,140 14,268  
Intercompany long term debt 0 0  
Deferred income taxes 1,011 1,672  
Derivative instruments 83 150  
Regulatory liabilities 2,242 1,277  
Other long-term liabilities 609 645  
Total long-term liabilities 17,644 18,681  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]      
Common Stock, Value, Issued 5,601 4,738 2,157
Preferred Stock, Value, Issued 709 709  
Contributed surplus 76 75  
Accumulated other comprehensive Income (188) 106  
Retained earnings 891 1,076  
Total Emera Incorporated equity 7,089 6,704  
Non-controlling interest in subsidiaries 92 112  
Total equity 7,181 6,816 $ 4,334
Liabilities and Equity, Total 28,771 29,221  
Consolidation, Eliminations [Member]      
Assets, Current [Abstract]      
Cash, Cash Equivalents, and Short-term Investments 0 0  
Restricted Cash and Cash Equivalents, Current 0 0  
AccountsReceivableRelatedPartiesCurrent (195) (646)  
Inventory, Net 0 0  
Derivative Instruments and Hedges, Assets (6) (13)  
Regulatory Assets, Current 0 0  
Other Assets, Current 0 0  
Total current assets (201) (659)  
Property, Plant and Equipment, Net 0 0  
Other Assets, Noncurrent [Abstract]      
Deferred income taxes 7 (38)  
Derivative instruments (4) (12)  
Regulatory assets 0 0  
Net investment in direct financing lease 0 0  
Investments In Subsidiaries (8,490) (8,349)  
Investments subject to significant influence 0 0  
Goodwill 0 0  
Intercompany notes receivable (6,381) (6,504)  
Other investments - intercompany (70) (2,270)  
Other long term assets (20) (19)  
Total other assets (14,958) (17,192)  
Assets, Total (15,159) (17,851)  
Liabilities, Current [Abstract]      
Short-term debt 0 0  
Current portion of long-term debt 0 0  
Accounts payable 0 0  
Intercompany payable (225) (646)  
Derivative instruments (5) (13)  
Regulatory liabilities (1) 0  
Other current liabilities 0 0  
Total current liabilities (231) (659)  
Liabilities, Noncurrent [Abstract]      
Long-term debt 0 0  
Intercompany long term debt (6,377) (6,501)  
Deferred income taxes 7 (38)  
Derivative instruments (4) (12)  
Regulatory liabilities 0 0  
Other long-term liabilities (19) (19)  
Total long-term liabilities (6,393) (6,570)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]      
Common Stock, Value, Issued (6,689) (8,416)  
Preferred Stock, Value, Issued (696) (891)  
Contributed surplus (258) (151)  
Accumulated other comprehensive Income 230 (159)  
Retained earnings (1,142) (1,039)  
Total Emera Incorporated equity (8,555) (10,656)  
Non-controlling interest in subsidiaries 20 34  
Total equity (8,535) (10,622)  
Liabilities and Equity, Total (15,159) (17,851)  
Parent Company [Member]      
Assets, Current [Abstract]      
Cash, Cash Equivalents, and Short-term Investments 276 200  
Restricted Cash and Cash Equivalents, Current 0 0  
AccountsReceivableRelatedPartiesCurrent 74 57  
Inventory, Net 0 0  
Derivative Instruments and Hedges, Assets 5 13  
Regulatory Assets, Current 0 0  
Other Assets, Current 3 3  
Total current assets 358 273  
Property, Plant and Equipment, Net 17 14  
Other Assets, Noncurrent [Abstract]      
Deferred income taxes 70 31  
Derivative instruments 4 12  
Regulatory assets 0 0  
Net investment in direct financing lease 0 0  
Investments In Subsidiaries 8,490 8,349  
Investments subject to significant influence 5 5  
Goodwill 0 0  
Intercompany notes receivable 1,140 1,341  
Other investments - intercompany 0 0  
Other long term assets 29 33  
Total other assets 9,738 9,771  
Assets, Total 10,113 10,058  
Liabilities, Current [Abstract]      
Short-term debt 0 0  
Current portion of long-term debt 0 0  
Accounts payable 9 6  
Intercompany payable 55 534  
Derivative instruments 5 14  
Regulatory liabilities 0 0  
Other current liabilities 60 54  
Total current liabilities 129 608  
Liabilities, Noncurrent [Abstract]      
Long-term debt 2,205 2,338  
Intercompany long term debt 656 366  
Deferred income taxes 0 0  
Derivative instruments 4 12  
Regulatory liabilities 0 0  
Other long-term liabilities 9 13  
Total long-term liabilities 2,895 2,746  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]      
Common Stock, Value, Issued 5,601 4,738  
Preferred Stock, Value, Issued 709 709  
Contributed surplus 76 75  
Accumulated other comprehensive Income (188) 106  
Retained earnings 891 1,076  
Total Emera Incorporated equity 7,089 6,704  
Non-controlling interest in subsidiaries 0 0  
Total equity 7,089 6,704  
Liabilities and Equity, Total 10,113 10,058  
Subsidiary Issuer [Member]      
Assets, Current [Abstract]      
Cash, Cash Equivalents, and Short-term Investments 21 28  
Restricted Cash and Cash Equivalents, Current 0 0  
AccountsReceivableRelatedPartiesCurrent 9 9  
Inventory, Net 0 0  
Derivative Instruments and Hedges, Assets 0 0  
Regulatory Assets, Current 0 0  
Other Assets, Current 0 0  
Total current assets 30 37  
Property, Plant and Equipment, Net 0 0  
Other Assets, Noncurrent [Abstract]      
Deferred income taxes 0 0  
Derivative instruments 0 0  
Regulatory assets 0 0  
Net investment in direct financing lease 0 0  
Investments In Subsidiaries 0 0  
Investments subject to significant influence 0 0  
Goodwill 0 0  
Intercompany notes receivable 4,285 4,558  
Other investments - intercompany 0 0  
Other long term assets 0 0  
Total other assets 4,285 4,558  
Assets, Total 4,315 4,595  
Liabilities, Current [Abstract]      
Short-term debt 0 0  
Current portion of long-term debt 0 0  
Accounts payable 0 0  
Intercompany payable 6 6  
Derivative instruments 0 0  
Regulatory liabilities 0 0  
Other current liabilities 6 13  
Total current liabilities 12 19  
Liabilities, Noncurrent [Abstract]      
Long-term debt 4,034 4,314  
Intercompany long term debt 0 0  
Deferred income taxes 4 1  
Derivative instruments 0 0  
Regulatory liabilities 0 0  
Other long-term liabilities 0 0  
Total long-term liabilities 4,038 4,315  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]      
Common Stock, Value, Issued 242 242  
Preferred Stock, Value, Issued 0 0  
Contributed surplus 0 0  
Accumulated other comprehensive Income (9) 10  
Retained earnings 32 9  
Total Emera Incorporated equity 265 261  
Non-controlling interest in subsidiaries 0 0  
Total equity 265 261  
Liabilities and Equity, Total 4,315 4,595  
Guarantor Subsidiaries [Member]      
Assets, Current [Abstract]      
Cash, Cash Equivalents, and Short-term Investments 47 48  
Restricted Cash and Cash Equivalents, Current 1 1  
AccountsReceivableRelatedPartiesCurrent 4 11  
Inventory, Net 243 273  
Derivative Instruments and Hedges, Assets 11 33  
Regulatory Assets, Current 114 54  
Other Assets, Current 546 478  
Total current assets 966 898  
Property, Plant and Equipment, Net 12,258 12,724  
Other Assets, Noncurrent [Abstract]      
Deferred income taxes (10) 18  
Derivative instruments 2 2  
Regulatory assets 552 647  
Net investment in direct financing lease 12 13  
Investments In Subsidiaries 0 0  
Investments subject to significant influence 13 13  
Goodwill 5,709 6,110  
Intercompany notes receivable 1 16  
Other investments - intercompany 0 0  
Other long term assets 68 85  
Total other assets 6,347 6,904  
Assets, Total 19,571 20,526  
Liabilities, Current [Abstract]      
Short-term debt 1,241 948  
Current portion of long-term debt 701 436  
Accounts payable 620 756  
Intercompany payable 90 81  
Derivative instruments 52 10  
Regulatory liabilities 91 225  
Other current liabilities 137 130  
Total current liabilities 2,932 2,586  
Liabilities, Noncurrent [Abstract]      
Long-term debt 3,741 4,687  
Intercompany long term debt 4,582 4,778  
Deferred income taxes 435 1,193  
Derivative instruments 4 0  
Regulatory liabilities 1,889 973  
Other long-term liabilities 267 274  
Total long-term liabilities 11,259 12,338  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]      
Common Stock, Value, Issued 4,311 4,177  
Preferred Stock, Value, Issued 620 620  
Contributed surplus 110 45  
Accumulated other comprehensive Income (36) 340  
Retained earnings 375 420  
Total Emera Incorporated equity 5,380 5,602  
Non-controlling interest in subsidiaries 0 0  
Total equity 5,380 5,602  
Liabilities and Equity, Total 19,571 20,526  
Non-Guarantor Subsidiaries [Member]      
Assets, Current [Abstract]      
Cash, Cash Equivalents, and Short-term Investments 94 128  
Restricted Cash and Cash Equivalents, Current 64 86  
AccountsReceivableRelatedPartiesCurrent 108 569  
Inventory, Net 175 199  
Derivative Instruments and Hedges, Assets 131 112  
Regulatory Assets, Current 24 26  
Other Assets, Current 777 842  
Total current assets 1,373 1,962  
Property, Plant and Equipment, Net 4,720 4,552  
Other Assets, Noncurrent [Abstract]      
Deferred income taxes 71 114  
Derivative instruments 110 129  
Regulatory assets 686 595  
Net investment in direct financing lease 469 475  
Investments In Subsidiaries 0 0  
Investments subject to significant influence 1,197 929  
Goodwill 96 103  
Intercompany notes receivable 955 589  
Other investments - intercompany 70 2,270  
Other long term assets 184 175  
Total other assets 3,838 5,379  
Assets, Total 9,931 11,893  
Liabilities, Current [Abstract]      
Short-term debt 0 13  
Current portion of long-term debt 40 40  
Accounts payable 532 480  
Intercompany payable 74 25  
Derivative instruments 175 314  
Regulatory liabilities 136 137  
Other current liabilities 147 161  
Total current liabilities 1,104 1,170  
Liabilities, Noncurrent [Abstract]      
Long-term debt 3,160 2,929  
Intercompany long term debt 1,139 1,357  
Deferred income taxes 565 516  
Derivative instruments 79 150  
Regulatory liabilities 353 304  
Other long-term liabilities 352 377  
Total long-term liabilities 5,845 5,852  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]      
Common Stock, Value, Issued 2,136 3,997  
Preferred Stock, Value, Issued 76 271  
Contributed surplus 148 106  
Accumulated other comprehensive Income (185) (191)  
Retained earnings 735 610  
Total Emera Incorporated equity 2,910 4,793  
Non-controlling interest in subsidiaries 72 78  
Total equity 2,982 4,871  
Liabilities and Equity, Total $ 9,931 $ 11,893