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Summary of Significant Accounting Policies (Nature of Operations) (Narrative) (Details)
$ in Billions
 2 Months Ended 3 Months Ended 12 Months Ended
Mar. 05, 2019
Mar. 29, 2019
Dec. 31, 2019
CAD ($)
MW
Customers
km
Dec. 20, 2019
EUS | Disposition        
Nature of operations [Line items]        
Disposition, Name       EUS
Description and Timing and Disposition       EUS ceased operations on September 30, 2019
New England Gas Generating Facilities | Disposition        
Nature of operations [Line items]        
Disposition, Name   New England Gas Generation    
Description and Timing and Disposition   The NEGG assets were classified as held for sale at December 31, 2018 and the Company ceased depreciation of these assets on November 27, 2018.    
Segment that Includes Disposition   Other reportable segment    
Bayside Power Limited Partnership | Disposition        
Nature of operations [Line items]        
Disposition, Name Bayside facility      
Segment that Includes Disposition Other reportable segment      
Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Emera’s investments in other energy-related non-regulated companies (included within the Other reportable segment) include the following: Emera Energy, which consists of: Emera Energy Services (“EES”), a physical energy business that purchases and sells natural gas and electricity and provides related energy asset management services; Brooklyn Power Corporation (“Brooklyn Energy”), a 30 MW biomass co-generation electricity facility in Brooklyn, Nova Scotia; and a 50.0 per cent joint venture interest in Bear Swamp Power Company LLC (“Bear Swamp”), a 600 MW pumped storage hydroelectric facility in northwestern Massachusetts. Emera Reinsurance Limited, a captive insurance company providing insurance and reinsurance to Emera and certain affiliates, to enable more cost-efficient management of risk and deductible levels across Emera; Emera US Finance LP (“Emera Finance”) and TECO Finance, Inc. (“TECO Finance”), financing subsidiaries of Emera; Emera US Holdings Inc., a wholly owned holding company for certain of Emera’s assets located in the United States; and other investments.  
Operating | Other Electric Utilities        
Nature of operations [Line items]        
Segment that Includes Disposition     Other Electric Utilities  
Operating | Other Electric Utilities | Held for sale        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     , a regulated electric transmission and distribution utility, serving approximately 159,000 customers in the state of Maine. On March 25, 2019, Emera announced an agreement to sell Emera Maine. The transaction is expected to close in early 2020, subject to approval of the Maine Public Utilities Commission (“MPUC”).  
Number of Customers     159,000  
Disposition, Name     Emera Maine  
Description and Timing and Disposition     On March 25, 2019, Emera announced an agreement to sell Emera Maine. The transaction is expected to close in early 2020, subject to approval of the Maine Public Utilities Commission (“MPUC”)  
Operating | Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     At December 31, 2019, Emera’s investments in other energy-related non-regulated companies (included within the Other reportable segment) include the following: Emera Energy, which consists of: Emera Energy Services (“EES”), a physical energy business that purchases and sells natural gas and electricity and provides related energy asset management services; Brooklyn Power Corporation (“Brooklyn Energy”), a 30 MW biomass co-generation electricity facility in Brooklyn, Nova Scotia; and a 50.0 per cent joint venture interest in Bear Swamp Power Company LLC (“Bear Swamp”), a 600 MW pumped storage hydroelectric facility in northwestern Massachusetts. Emera Reinsurance Limited, a captive insurance company providing insurance and reinsurance to Emera and certain affiliates, to enable more cost-efficient management of risk and deductible levels across Emera; Emera US Finance LP (“Emera Finance”) and TECO Finance, Inc. (“TECO Finance”), financing subsidiaries of Emera; Emera US Holdings Inc., a wholly owned holding company for certain of Emera’s assets located in the United States; and other investments.  
Maritimes and Northeast Pipline | Gas Utilities and Infrastructure        
Nature of operations [Line items]        
Equity Method Investment, Ownership Percentage     12.90%  
St. Lucia Electricity Services Limited | Operating | Other Electric Utilities        
Nature of operations [Line items]        
Equity Method Investment, Ownership Percentage     19.10%  
Dominica Electricity Services Ltd. | Operating | Other Electric Utilities        
Nature of operations [Line items]        
Equity Method Investment, Ownership Percentage     51.90%  
Number of Customers     31,000  
Tampa Electric | Operating | Florida Electric Utility        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Tampa Electric, a vertically integrated regulated electric utility, serving approximately 779,000 customers in West Central Florida  
Number of Customers     779,000  
Nova Scotia Power Inc. | Operating | Canadian Electric Utilities        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Nova Scotia Power Inc. (“NSPI”), a vertically integrated regulated electric utility and the primary electricity supplier in Nova Scotia, serving approximately 523,000 customers  
Number of Customers     523,000  
Emera Newfoundland and Labrador Holdings Inc. | Operating | Canadian Electric Utilities        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Emera Newfoundland & Labrador Holdings Inc. (“ENL”), consisting of two transmission investments related to an 824 megawatt (“MW”) hydroelectric generating facility at Muskrat Falls on the Lower Churchill River in Labrador being developed by Nalcor Energy and forecasted to be generating full power in the second half of 2020. ENL’s two investments are: a 100 per cent investment in NSP Maritime Link Inc. (“NSPML”), which developed the Maritime Link Project, a $1.6 billion transmission project, including two 170-kilometre sub-sea cables, connecting the island of Newfoundland and Nova Scotia. This project went in service on January 15, 2018; and a ##D<LIL_%Ownership> per cent investment in the partnership capital of Labrador-Island Link Limited Partnership (“LIL”), a $3.7 billion electricity transmission project in Newfoundland and Labrador to enable the transmission of Muskrat Falls energy between Labrador and the island of Newfoundland. Construction of the LIL has been completed and Nalcor recognized the first flow of energy from Labrador to Newfoundland in June 2018. Nalcor continues to work towards commissioning the LIL, which is forecasted to be in 2020.  
Public Utilities Property Plant And Equipment Generation Capacity | MW     824  
Emera Newfoundland and Labrador Holdings Inc. | NSP Maritime Link Inc. | Operating | Canadian Electric Utilities        
Nature of operations [Line items]        
Equity Method Investment, Ownership Percentage     100.00%  
Public Utilities, Equipment, Transmission and Distribution | $     $ 1.6  
Length Of Pipeline | km     170  
Emera Newfoundland and Labrador Holdings Inc. | Labrador-Island Link Limited Partnership | Operating | Canadian Electric Utilities        
Nature of operations [Line items]        
Equity Method Investment, Ownership Percentage     49.50%  
Public Utilities, Equipment, Transmission and Distribution | $     $ 3.7  
Emera (Caribbean) Incorporated | Operating | Other Electric Utilities        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Emera (Caribbean) Incorporated (“ECI”), a holding company with regulated electric utilities that include: The Barbados Light & Power Company Limited (“BLPC”), a vertically integrated regulated electric utility on the island of Barbados, serving approximately 131,000 customers; Grand Bahama Power Company Limited (“GBPC”), a vertically integrated regulated electric utility on Grand Bahama Island, serving approximately 18,000 customers. On September 1, 2019, Grand Bahama Island was struck by Hurricane Dorian, causing significant damage. Refer to note ##NRM and ##NGW for further details; a 51.9 per cent interest in Dominica Electricity Services Ltd. (“Domlec”), a vertically integrated regulated electric utility on the island of Dominica, serving approximately 31,000 customers; and a 19.1 per cent equity interest in St. Lucia Electricity Services Limited (“Lucelec”), a vertically integrated regulated electric utility on the island of St. Lucia.  
Barbados Light and Power Company Limited | Operating | Other Electric Utilities        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     The Barbados Light & Power Company Limited (“BLPC”), a vertically integrated regulated electric utility on the island of Barbados, serving approximately 131,000 customers;  
Number of Customers     131,000  
Grand Bahama Power Company Limited | Operating | Other Electric Utilities        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Grand Bahama Power Company Limited (“GBPC”), a vertically integrated regulated electric utility on Grand Bahama Island, serving approximately 18,000 customers. On September 1, 2019, Grand Bahama Island was struck by Hurricane Dorian, causing significant damage. Refer to note ##NRM and ##NGW for further details;  
Number of Customers     18,000  
Dominica Electricity Services Ltd. | Operating | Other Electric Utilities        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     a 51.9 per cent interest in Dominica Electricity Services Ltd. (“Domlec”), a vertically integrated regulated electric utility on the island of Dominica, serving approximately 31,000 customers  
Peoples Gas System Division        
Nature of operations [Line items]        
Length Of Pipeline | km     800  
Peoples Gas System Division | Gas Utilities and Infrastructure        
Nature of operations [Line items]        
Number of Customers     406,000  
Peoples Gas System Division | Operating | Gas Utilities and Infrastructure        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Peoples Gas System (“PGS”), a regulated gas distribution utility, serving approximately 406,000 customers across Florida;  
New Mexico Gas Company | Gas Utilities and Infrastructure        
Nature of operations [Line items]        
Number of Customers     534,000  
New Mexico Gas Company | Operating | Gas Utilities and Infrastructure        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     New Mexico Gas Company, Inc. (“NMGC”), a regulated gas distribution utility, serving approximately 534,000 customers in New Mexico;  
SeaCoast Gas Transmission, LLC | Operating | Gas Utilities and Infrastructure        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     SeaCoast Gas Transmission, LLC (“SeaCoast”), a regulated intrastate natural gas transmission company offering services in Florida  
Emera Brunswick Pipeline Company Limited | Gas Utilities and Infrastructure        
Nature of operations [Line items]        
Length Of Pipeline | km     145  
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life     25 years  
Emera Brunswick Pipeline Company Limited | Operating | Gas Utilities and Infrastructure        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Emera Brunswick Pipeline Company Limited (“Brunswick Pipeline”), a 145-kilometre pipeline delivering re-gasified liquefied natural gas (“LNG”) from Saint John, New Brunswick to the United States border under a 25-year firm service agreement with Repsol Energy Canada, which expires in 2034  
Emera Energy | Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Emera Energy Services (“EES”), a physical energy business that purchases and sells natural gas and electricity and provides related energy asset management services; Brooklyn Power Corporation (“Brooklyn Energy”), a 30 MW biomass co-generation electricity facility in Brooklyn, Nova Scotia; and a 50.0 per cent joint venture interest in Bear Swamp Power Company LLC (“Bear Swamp”), a 600 MW pumped storage hydroelectric facility in northwestern Massachusetts.  
Emera Energy | Bear Swamp Power Company LLC | Other        
Nature of operations [Line items]        
Equity Method Investment, Ownership Percentage     50.00%  
Public Utilities Property Plant And Equipment Generation Capacity | MW     600  
Emera Energy Services | Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Emera Energy Services (“EES”), a physical energy business that purchases and sells natural gas and electricity and provides related energy asset management services;  
Brooklyn Power Corporation | Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Brooklyn Power Corporation (“Brooklyn Energy”), a 30 MW biomass co-generation electricity facility in Brooklyn, Nova Scotia;  
Emera Reinsurance Limited | Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Emera Reinsurance Limited, a captive insurance company providing insurance and reinsurance to Emera and certain affiliates, to enable more cost-efficient management of risk and deductible levels across Emera;  
Emera US Finance LP | Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     financing subsidiaries of Emera;  
TECO Finance, Inc. | Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     financing subsidiaries of Emera;  
Emera US Holdings Inc. | Other        
Nature of operations [Line items]        
Segment Reporting, Additional Information about Entity's Reportable Segments     Emera US Holdings Inc., a wholly owned holding company for certain of Emera’s assets located in the United States; and