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Non-controlling Interest In Subsidiaries (Non-controlling interest in subsidiaries ) (Details) - CAD
shares in Millions, CAD in Millions
 12 Months Ended
Dec. 17, 2015
Dec. 31, 2016
Mar. 22, 2016
Dec. 31, 2015
Noncontrolling Interest [Line Items]        
Stockholders' Equity Attributable to Noncontrolling Interest   CAD 112   CAD 134
Icd Utilities Limited [Member]        
Noncontrolling Interest [Line Items]        
Stockholders' Equity Attributable to Noncontrolling Interest   CAD 53   52
Emera (Caribbean) Incorporated Parent [Member]        
Noncontrolling Interest [Line Items]        
Stockholders' Equity Attributable to Noncontrolling Interest [1]       CAD 25
Indirect Wholly-owned Subsidiary, Shares Acquired 2.6 0.7    
Equity Method Investment, Ownership Percentage   95.50% 80.70%  
Controlling Interest Ownership Percentage By Parent   100.00% 95.50% 95.50%
Grand Bahama Power Company Limited [Member]        
Noncontrolling Interest [Line Items]        
Noncontrolling Interest, Amount Represented by Preferred Stock   CAD 34   CAD 34
Dominica Electricity Services Ltd. [Member]        
Noncontrolling Interest [Line Items]        
Stockholders' Equity Attributable to Noncontrolling Interest   CAD 25   CAD 23
Noncontrolling Interest, Ownership Percentage by Parent   51.90%    
[1]
(1) On December 17, 2015, an indirect wholly owned subsidiary of Emera acquired approximately 2.6 million ECI shares, increasing its ownership interest from 80.7 per cent to 95.5 per cent. On March 22, 2016, an indirect wholly-owned subsidiary of Emera acquired 0.7 million ECI shares (which owns 51.9 per cent share of Domlec), increasing Emera's ownership interest in ECI from 95.5 to 100 per cent.