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Regulatory Assets and Liabilities - Gas Utilities and Infrastructure (Narrative) (Details)
$ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 17, 2019
USD ($)
Jan. 31, 2021
USD ($)
Sep. 30, 2019
CAD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2020
USD ($)
km
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Public Utilities, General Disclosures [Line Items]                  
Income tax expense (recovery)         $ (341) $ (61)      
Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Income tax expense (recovery)         $ (51) $ (48)      
Emera Brunswick Pipeline Company Limited | Gas Utilities and Infrastructure                  
Public Utilities, General Disclosures [Line Items]                  
Length Of Pipeline | km             145    
Emera Brunswick Pipeline Company Limited | Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Length Of Pipeline | km             145    
Public Utilities, Property, Plant and Equipment, Transmission and Distribution, Useful Life         25 years        
NMGC | Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity         9.10%        
Public Utilities, Phase-in Plan Terms         On July 17, 2019, the NMPRC approved a rate increase for NMGC effective August 2019 and allowed NMGC to retain tax reform benefits realized from January 1, 2018 to the effective date of the new rates. The new rates were phased in over two years, resulting in an annual revenue increase of approximately $3 million USD.        
Deferred Tax Liabilities, Regulatory Assets and Liabilities               $ 11 $ 8
Income tax expense (recovery)     $ 7 $ 5          
NMGC | Range, Minimum | Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity           9.10%      
NMGC | Range, Maximum | Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity           10.00%      
NMGC | New Mexico Public Regulatory | Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Phase-in Plan, Amount of Capitalized Costs Recovered $ 3                
NMGC | New Mexico Public Regulatory | Gas Utilities and Infrastructure | Operating | Scenario Plan                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity   9.375%              
Allowed equity capital structure   52.00%              
Phase-in Plan, Amount of Capitalized Costs Recovered   $ 5              
PGS | Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity         10.75%        
Allowed equity capital structure         54.70%        
Length Of Pipeline, percentage             5.00%    
Length Of Pipeline | km             800    
Replacement program             $ 80    
Regulatory Asset Amortization Period         10 years        
Public Utilities, Disclosure of Rate Matters         PGS was permitted to initiate a general base rate proceeding during 2020, provided the new rates do not become effective before January 1, 2021. On June 8, 2020, PGS filed a petition for an increase in rates and service charges effective January 2021. On November 19, 2020, the FPSC approved a settlement agreement filed by PGS.        
PGS | Gas Utilities and Infrastructure | Operating | Scenario Plan                  
Public Utilities, General Disclosures [Line Items]                  
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)   34              
Phase-in Plan, Amount of Capitalized Costs Recovered   34              
Public Utilities, Approved Rate Increase (Decrease), Amount   58              
PGS | Gas Utilities and Infrastructure | Operating | Cast Iron/Bare Steel Pipe Replacement                  
Public Utilities, General Disclosures [Line Items]                  
Length Of Pipeline | km             880    
PGS | Gas Utilities and Infrastructure | Operating | Cast Iron/Bare Steel Pipe Replacement | Scenario Plan                  
Public Utilities, General Disclosures [Line Items]                  
Phase-in Plan, Amount of Capitalized Costs Recovered   $ 24              
PGS | Range, Minimum | Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity         9.25% 9.25%      
PGS | Range, Minimum | Gas Utilities and Infrastructure | Operating | Scenario Plan                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity   8.90%              
Allowed equity capital structure   54.70%              
PGS | Range, Maximum | Gas Utilities and Infrastructure | Operating                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity         11.75% 11.75%      
PGS | Range, Maximum | Gas Utilities and Infrastructure | Operating | Scenario Plan                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity   11.00%              
PGS | Mid Point | Gas Utilities and Infrastructure | Operating | Scenario Plan                  
Public Utilities, General Disclosures [Line Items]                  
Approved regulated return on equity   9.90%