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Commitments and Contingencies (Guarantees and Letters of Credit) (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Nova Scotia Power Inc. [Member]        
Guarantor Obligations [Line Items]        
Guaranty Liabilities $ 119   $ 118  
Letters of Credit Outstanding, Amount   $ 63   $ 64
Emera Reinsurance Limited        
Guarantor Obligations [Line Items]        
Guaranty Liabilities $ 35      
Guarantor Obligations, Origin and Purpose relating to outstanding notes of GBPC      
Guarantor Obligations, Term expire in May 2023      
TECO Energy        
Guarantor Obligations [Line Items]        
Letters of Credit Outstanding, Amount $ 13      
Guarantor Obligations, Maximum Exposure, Undiscounted 13      
TECO Energy | SeaCoast Gas Transmission, LLC        
Guarantor Obligations [Line Items]        
Guarantor Obligations, Maximum Exposure, Undiscounted 45      
ECI        
Guarantor Obligations [Line Items]        
Guaranty Liabilities 66      
Payment Guarantee | SeaCoast Gas Transmission, LLC        
Guarantor Obligations [Line Items]        
Letters of Credit Outstanding, Amount 27      
Surety Bonds        
Guarantor Obligations [Line Items]        
Letters of Credit Outstanding, Amount $ 145   $ 148