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Regulatory Assets and Liabilities (Narrative) (Details)
$ in Millions, $ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2019
USD ($)
Sep. 12, 2018
USD ($)
Aug. 20, 2018
USD ($)
Jan. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
km
MW
Dec. 31, 2019
USD ($)
MW
Dec. 31, 2018
CAD ($)
Dec. 31, 2019
USD ($)
km
Dec. 31, 2018
USD ($)
Dec. 13, 2016
CAD ($)
Dec. 31, 2015
CAD ($)
Public Utilities, General Disclosures [Line Items]                                  
Regulatory Liabilities           $ 2,610         $ 2,181   $ 2,610        
Depreciation and amortization                     903   916        
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses                     1,464   1,580        
Contractual Obligation, to be Paid, Year One                     1,950            
Contractual Obligation, to be Paid, Year Two                     970            
Income tax expense (recovery)                     (61)   (69)        
Regulatory Assets           1,569         $ 1,552   $ 1,569        
State income tax                     8.00% 8.00% 8.00%        
Regulated fuel adjustment mechanism                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory Liabilities           161         $ 115   $ 161        
Cost recovery clauses                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory Assets           75         13   75        
Renewable Energy Program                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory Assets           24         19   24        
Environmental remediations                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory Assets           31         26   31        
Unamortized defeasance costs                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory Assets           $ 26         19   $ 26        
Emera Maine                                  
Public Utilities, General Disclosures [Line Items]                                  
Contractual Obligation, to be Paid, Year One                     49            
Contractual Obligation, to be Paid, Year Two                     $ 0            
Barbados Light and Power Company Limited                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     10.00% 10.00%          
Deferred Tax Liabilities, Regulatory Assets and Liabilities                           $ 6.9      
Income tax expense (recovery)                       $ 9.6          
GBPC                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity           8.44%         8.50% 8.50% 8.50%        
GBPC | Loss from Catastrophes | Hurricane                                  
Public Utilities, General Disclosures [Line Items]                                  
Storm cost                     $ 15 $ 12.0          
Storm Reserve                     $ 23            
Brunswick Pipeline                                  
Public Utilities, General Disclosures [Line Items]                                  
Length Of Pipeline | km                     145     145      
Public Utilities, Property, Plant and Equipment, Transmission and Distribution, Useful Life                     25 years 25 years          
NSPI                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulated common equity component                     40.00% 40.00%          
Contractual Obligation, to be Paid, Year One                     $ 0            
Contractual Obligation, to be Paid, Year Two                     0            
NSPI | NSPML                                  
Public Utilities, General Disclosures [Line Items]                                  
Phase-in Plan, Amount of Costs Deferred for Rate-making Purposes                     10            
Regulatory Liabilities           $ 110         111   $ 110        
Approved payment in period                     $ 101            
Interim cost assessment, holdback                     The payments are subject to a holdback of $10 million pending UARB agreement that a minimum of $10 million in benefits from the Maritime Link are realized for NSPI customers. If the $10 million in benefits is realized, the UARB will direct NSPI to pay the $10 million to NSPML for that year. If not realized, then the UARB will direct NSPI to pay to NSPML only that portion that is realized and the balance will be refunded to customers through NSPI’s FAM. The payments are subject to a holdback of $10 million pending UARB agreement that a minimum of $10 million in benefits from the Maritime Link are realized for NSPI customers. If the $10 million in benefits is realized, the UARB will direct NSPI to pay the $10 million to NSPML for that year. If not realized, then the UARB will direct NSPI to pay to NSPML only that portion that is realized and the balance will be refunded to customers through NSPI’s FAM.          
Holdback payable                     $ 6            
Depreciation and amortization                     53   53        
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses                     115            
Depreciation and amortization of financing costs                     30            
Contractual Obligation, to be Paid, Year One                     145            
Contractual Obligation, to be Paid, Year Two                     111            
Phase-in Plan, Amount of Capitalized Costs Recovered                     $ 35   17        
Regulatory Asset Recovery Assessments                     On December 6, 2019, the UARB approved NSPI’s three-year fuel stability plan which results in an average annual overall rate increase of 1.5 per cent to recover fuel costs for the period of 2020 through 2022. For the years 2020 to 2022, differences between actual fuel costs and fuel revenues recovered from customers will be recovered from or returned to customers after 2022. The decision further directed that annual excess non-fuel revenues above NSPI’s approved range of ROE are to be applied to the FAM. On December 6, 2019, the UARB approved NSPI’s three-year fuel stability plan which results in an average annual overall rate increase of 1.5 per cent to recover fuel costs for the period of 2020 through 2022. For the years 2020 to 2022, differences between actual fuel costs and fuel revenues recovered from customers will be recovered from or returned to customers after 2022. The decision further directed that annual excess non-fuel revenues above NSPI’s approved range of ROE are to be applied to the FAM.          
Recovery Period                     3 years 3 years          
NSPI | NSPML | Regulated fuel adjustment mechanism                                  
Public Utilities, General Disclosures [Line Items]                                  
Holdback payable                     $ 10            
NSPI | NSPML | Regulated fuel adjustment mechanism | Scenario Plan                                  
Public Utilities, General Disclosures [Line Items]                                  
Phase-in Plan, Amount of Costs Deferred for Rate-making Purposes                     $ 52            
Phase-in Plan, Amount of Capitalized Costs Recovered                 $ 12 $ 40              
Regulatory Asset Recovery Assessments                     The UARB’s decision to approve NSPI’s 2020 through 2022 Fuel Stability Plan outlined the treatment of the reduced 2019 NSPML assessment of $52 million plus interest. The reduced assessment will be refunded to most customers through a reduction incorporated into their 2020 through 2022 rates and the remaining customers will receive a one-time on bill credit in 2020.The credit to customers will be approximately $40 million plus interest in 2020, with the remaining $12 million plus interest to be returned to customers subsequent to 2022. The UARB’s decision to approve NSPI’s 2020 through 2022 Fuel Stability Plan outlined the treatment of the reduced 2019 NSPML assessment of $52 million plus interest. The reduced assessment will be refunded to most customers through a reduction incorporated into their 2020 through 2022 rates and the remaining customers will receive a one-time on bill credit in 2020.The credit to customers will be approximately $40 million plus interest in 2020, with the remaining $12 million plus interest to be returned to customers subsequent to 2022.          
NSPI | Renewable Energy Program                                  
Public Utilities, General Disclosures [Line Items]                                  
Replacement program                               $ 31 $ 35
NSPI | Unamortized defeasance costs | Defeased debt                                  
Public Utilities, General Disclosures [Line Items]                                  
Long-term debt           759         $ 740   759        
NMGC                                  
Public Utilities, General Disclosures [Line Items]                                  
Public Utilities, Disclosure of Rate Matters                     NMGC is subject to regulation by the NMPRC. The NMPRC sets rates at a level that allows NMGC to collect total revenues equal to its cost of providing service, plus an appropriate return on invested capital. NMGC is subject to regulation by the NMPRC. The NMPRC sets rates at a level that allows NMGC to collect total revenues equal to its cost of providing service, plus an appropriate return on invested capital.          
Approved regulated return on equity                     9.10% 9.10%          
Allowed equity capital structure                     52.00% 52.00%          
Contractual Obligation, to be Paid, Year One                     $ 0            
Contractual Obligation, to be Paid, Year Two                     $ 0            
Deferred Tax Liabilities, Regulatory Assets and Liabilities           $ 11             $ 11   $ 8.0    
PGS                                  
Public Utilities, General Disclosures [Line Items]                                  
Public Utilities, Disclosure of Rate Matters                     PGS is regulated by the FPSC. The FPSC sets rates at a level that allows utilities such as PGS to collect total revenues or revenue requirements equal to their cost of providing service, plus an appropriate return on invested capital. PGS is regulated by the FPSC. The FPSC sets rates at a level that allows utilities such as PGS to collect total revenues or revenue requirements equal to their cost of providing service, plus an appropriate return on invested capital.          
Approved regulated return on equity                     10.75% 10.75%          
Allowed equity capital structure                     54.70% 54.70%          
Length Of Pipeline | km                     800     800      
Contractual Obligation, to be Paid, Year One                     $ 0            
Contractual Obligation, to be Paid, Year Two                     $ 61            
Length Of Pipeline, percentage                     5.00%     5.00%      
Replacement program                           $ 80.0      
Amortization of Regulatory Asset   $ 11.0                              
Public utilities base rate decrease $ 12.0                                
Reduction in annual depreciation $ 10.0                                
Regulatory Asset Amortization Period                     10 years 10 years          
Tampa Electric                                  
Public Utilities, General Disclosures [Line Items]                                  
Contractual Obligation, to be Paid, Year One                     $ 0            
Contractual Obligation, to be Paid, Year Two                     $ 301            
State income tax                     4.46% 4.46% 5.50%        
Tampa Electric | Hurricane                                  
Public Utilities, General Disclosures [Line Items]                                  
Storm cost         $ 8.0                        
Tampa Electric | SoBRA                                  
Public Utilities, General Disclosures [Line Items]                                  
Public Utilities, Property, Plant and Equipment, Generation or Processing                           820.0      
Estimated revenue in MW | MW                     600 600          
Tampa Electric | SoBRA | Scenario Plan                                  
Public Utilities, General Disclosures [Line Items]                                  
Public Utilities, Property, Plant and Equipment, Generation or Processing                           $ 30.0      
Maritime Link Project | NSPI                                  
Public Utilities, General Disclosures [Line Items]                                  
Contractual Obligation, to be Paid, Year One                     $ 145            
Contractual Obligation, to be Paid, Year Two                     $ 164            
Steam turbine | GBPC                                  
Public Utilities, General Disclosures [Line Items]                                  
Public Utilities, Property, Plant and Equipment, Amount of Loss (Recovery) on Plant Abandonment                       $ 21.0          
New Mexico Public Regulatory | NMGC                                  
Public Utilities, General Disclosures [Line Items]                                  
Phase-in Plan, Amount of Capitalized Costs Recovered                       $ 3.0          
Public Utilities, Disclosure of Regulatory Matters Pending                     On December 23, 2019, NMGC filed a future year rate case on December 23, 2019 for new rates effective January 2021. The proposed new rates reflect the recovery of capital investment in pipelines and related infrastructure. The estimated annual incremental revenue requirement is approximately $13 million USD. A decision from the NMPRC is expected in late 2020. On December 23, 2019, NMGC filed a future year rate case on December 23, 2019 for new rates effective January 2021. The proposed new rates reflect the recovery of capital investment in pipelines and related infrastructure. The estimated annual incremental revenue requirement is approximately $13 million USD. A decision from the NMPRC is expected in late 2020.          
Public Utilities, Phase-in Plan Terms                     The new rates are being phased in over two years and are expected to result in an annual revenue increase of approximately $3 million USD. The new rates are being phased in over two years and are expected to result in an annual revenue increase of approximately $3 million USD.          
Public Utilities, Requested Rate Increase (Decrease), Amount                       $ 13.0          
Income tax expense (recovery)                     $ 7 $ 5.0          
MPUC | Emera Maine                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved average annual increase             5.30%                    
Approved regulated return on equity               9.00%     9.35% 9.35%          
Allowed equity capital structure                     49.00% 49.00% 49.00%        
FERC | Emera Maine                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     10.57% 10.57% 10.57%        
FERC | Electric Transmission | Emera Maine                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     9.60% 9.60% 9.60%        
Electricity Plan Act | NSPI                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved average annual increase                     1.50% 1.50%          
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage                     1.50% 1.50%          
Florida Public Service Commission | Tampa Electric                                  
Public Utilities, General Disclosures [Line Items]                                  
Public Utilities, Disclosure of Rate Matters                     Tampa Electric is regulated by the FPSC. Tampa Electric is also subject to regulation by the Federal Energy Regulatory Commission (“FERC”). The FPSC sets rates at a level that allows utilities such as Tampa Electric to collect total revenues or revenue requirements equal to their cost of providing service, plus an appropriate return on invested capital. Tampa Electric is regulated by the FPSC. Tampa Electric is also subject to regulation by the Federal Energy Regulatory Commission (“FERC”). The FPSC sets rates at a level that allows utilities such as Tampa Electric to collect total revenues or revenue requirements equal to their cost of providing service, plus an appropriate return on invested capital.          
Allowed equity capital structure                     54.00% 54.00%          
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 103.0                 $ 5.0          
Florida Public Service Commission | Tampa Electric | Subsequent Event                                  
Public Utilities, General Disclosures [Line Items]                                  
Storm cost       $ 12.0                          
Florida Public Service Commission | Tampa Electric | Cost recovery clauses                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     10.25% 10.25%          
Florida Public Service Commission | Tampa Electric | SoBRA                                  
Public Utilities, General Disclosures [Line Items]                                  
Estimated revenue                       $ 96.0          
Estimated revenue in MW | MW                     554 554          
Range, Minimum | NSPI                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     8.75% 8.75%          
Range, Minimum | NSPI | NSPML                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     8.75% 8.75%          
Range, Minimum | PGS                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     9.25% 9.25%          
Range, Minimum | FERC | ISO-New England ("ISO-NE") Open Access Transmission Tariff ("OATT") | Emera Maine                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     11.07% 11.07% 11.07%        
Range, Minimum | Florida Public Service Commission | Tampa Electric                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     9.25% 9.25% 9.25%        
Range, Maximum | NSPI                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     9.25% 9.25%          
Range, Maximum | NSPI | NSPML                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     9.25% 9.25%          
Regulated common equity component                     30.00% 30.00%          
Range, Maximum | PGS                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     11.75% 11.75%          
Range, Maximum | FERC | ISO-New England ("ISO-NE") Open Access Transmission Tariff ("OATT") | Emera Maine                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     11.74% 11.74% 11.74%        
Range, Maximum | Florida Public Service Commission | Tampa Electric                                  
Public Utilities, General Disclosures [Line Items]                                  
Approved regulated return on equity                     11.25% 11.25% 11.25%